Hopefully you'll find something useful you haven't seen before.
http://www.zimmers.net/anonftp/pub/cbm/ Zimmers database of CBM downloads and documents
http://noname.c64.org/csdb/ - The C64 Scene Database (Browse to the TOOLS section!)
http://noname.c64.org/csdb/forums/ CSDb - User Forums C64 Scene Forums
http://4jays.net/store/ 4JAYS Video Games, some CBM stuff for sale
http://www.64andmore.com/ 64 & More Store CBM & Amiga stuff for sale
http://ist.uwaterloo.ca/~schepers/download.html 64Copy Central PAL assembler, etc.
http://tech.groups.yahoo.com/group/64hdd/ 64HDD - The CBM Drive Emulator Yahoo Group
http://www.6502.org/ Information, links, and projects for enthusiasts of the 6502
http://8bitprodserv.spaces.live.com/default.aspx 8-Bit Design's Products & Services (Video and serial cables, etc.)
http://www.aceware.iinet.net.au/acms/default.htm Australian Computer Museum Society, catalog of many CBM books
http://www.jammingsignal.com/c64/AhoyDisks.zip Ahoy! Disk Archive Zip
http://www.unitechelectronics.com/amigasellout.htm ALL AMIGA STOCK MUST GO (really, it must!)
http://www.devili.iki.fi/pub/Commodore/docs/ Ancient file library
http://mysite.verizon.net/wiskow/ Andrew Wiskow's Personal Website, Cottonwood BBS
http://www.arcadecomponents.com/index.html Old replacement parts, some good for CBM
http://cbm.videocam.net.au/index.php C= Homestead: CBM news, articles, and BBS stuff
http://www.z80.eu/c128.html C128 How to make a CP/M disk
http://user.tninet.se/~pug510w/datormuseum/c128software.html A handful of interesting and unique programs
http://picobay.com/dtv_wiki/index.php?title=C64_DTV_Hacking_Wiki C64 DTV Hacking Wiki
http://ftp.pokefinder.org/ C64 FTP File Search, currently indexing 144084 files (12 GB) on 10 servers.
http://www.c64.com/ C64.COM Get your favorite games and demos here!
http://cbmfiles.com/ CBM Files Online GEOS and Genie downloads
http://ftp.giga.or.at/pub/c64/library/exp-1764to512kB.html CBM: Expansion - 1764 to 512kB
http://www.trikaliotis.net/cbm4win#suppos CBM4WIN Read/Write CBM files on CBM drives from PC
http://www.softwolves.pp.se/misc/arkiv/cbm-hackers/ cbm-hackers mailing list archives
http://www.cc65.org/ cc65 - a freeware C compiler for 6502 based systems
http://www.geocities.com/c64-128-amiga/sale/ Cincinnati Commodore Compuer Club Sale Listings
http://www.atarimagazines.com/ Classic Computer Magazine Archive Indexes and some full text of Creative Computing, Compute!, Compute's Gazzette, etc.
http://www.classiccomputing.com/ Listen to The Classic Computing Podcast.
http://cmdrkey.com/ Click Here Software CMD products and GEOS
http://www.c64.cc/Tools/more3.html COCOS - Commodore Computer Sitelist
http://users.macunlimited.net/kenross/INDEXC.HTML Comal Archive
http://www.commodore128.org/ Commodore 128 Alive! Great forums and download database
http://folkvagn.commodore64.org/c128assembly.htm Commodore 128 assembly programming
http://groups.google.com/group/comp.sys.cbm/browse_thread/thread/e09f9161c059251b/dbc4b68da37595dd Commodore 128 specific programs
http://www.c128.net/ Graphic Booster and Tool BASIC info (English page available)
http://c64preservation.com/ C64 Preservation Project archiving original C64 software, uncracked
http://www.lemon64.com/forum/viewtopic.php?t=15630 How to get Star Commander working under Windows XP
http://www.haddewig.de/nogames64/ Commodore 64 Software Utilities, not games
http://www.commodorecomputercenter.com/ CBM & Amiga stuff for sale
http://www.faqs.org/faqs/commodore/ Commodore FAQs Usenet archive
http://groups.google.com/group/comp.sys.cbm/browse_thread/thread/2d92f986ce465611/db7fc9ba13e241f4#db7fc9ba13e241f4 Commodore FTP Sites Listing -- Last update 24 Jun 2006
http://www.canberra.edu.au/~scott/C=Hacking/ Commodore Hacking Magazine
http://www.dickestel.com/commodore.htm nice set of links
http://www.geocities.com/profdredd/commodore_links/golinx64.htm another nice collection of links
http://home1.gte.net/longrj2/cpsl/index.html Antiquated source list for CBM
http://s.webring.com/t/Commodore-Ring Commodore web ring
http://landover.no-ip.com/cbc.html comp.binaries.cbm archives
http://www.archivum.info/comp.sys.cbm/ comp.sys.cbm archives
http://c64upgra.de/c-one/ C-ONE Reconfigurable Computer
http://members.tripod.com/~rvbelzen/cpm/index.html CP/M System and Additional utility files for C128
http://www.herne.com/cpm.htm CP/M Utilities for C128. Herne Data Systems.
http://www.npsnet.com/danf/cbm/ lists of languages, magazine indices and links to programming information.
http://www.digikey.com/ new parts, some for CBM
http://www.digitaldinos.com/DigitalDinos/Pages/ForSale/Commodore/docCommodore.htm Commodore CBM stuff for sale
http://www.oldskool.org/disk2fdi/trial.html Trial DOS program to read CBM (and other format) disks
http://www.emuasylum.com/index.php?page=roms All the games for every machine ever made.
http://www.expresspcb.com/ExpressPCBHtm/SpecsMiniboard.htm ExpressPCB - Free PCB layout software - Low cost circuit boards
http://www.fragit.net/cbm/ Commercial BBS file archive
http://www.phs-edv.de/c64s/Ftpz.htm Ftp Sites for CBM, some are even still there!
http://www.filewatcher.com/b/ftp/ftp.pitt.edu/software/cbm.0.0.html Compuserve Archive CD-ROM online
http://www.futurlec.com/index.shtml Electronic Components and Semiconductor Superstore
http://www.gb64.com/ home of The Gamebase Collection of over 15000 games
http://www.go64.de/english/frames/frame.htm GO64! Defunct but useful CBM magazine from Germany
http://members.aol.com/howtogodot/welcome.htm GoDot Hires Graphics editor for C64
http://www.cs.tut.fi/~albert/Dev/gunzip/ GZIP Decompressor for C64
http://www.commodorescene.servebbs.org/helpadvicedownload.html Sams Computerfacts 128 - SOME page scans from said manual
http://www.devili.iki.fi/library/browse/book.en.html HomeLib browse Books
http://home.ica.net/~leifb/commodore/carts/ How to make your own Commodore Cartridges
http://www.softwolves.pp.se/idoc/ multi-language CBM doc preservation
http://members.tripod.com/~petlibrary/ CBM/PET help & links, commodore software library
http://www.jbrain.com/pub/cbm/ Jim Brain's archive
http://www.zimmers.net/anonftp/pub/cbm/manuals/anthology/index.html Inner Space Anthology The full text of this Transactor book as page scans
http://www.jppbm.com/ CBM stuff for sale
http://www.portcommodore.com/cbminfo.php?path=main-cbmidx- Some VERY nice charts, among other useful stuff
http://www.lemon64.com/ Lemon - Commodore 64 Heaven
http://www.ramblehouse.com/loadstarcompleat.htm LOADSTAR COMPLEAT buy on CD from Fender Tucker
http://lng.sourceforge.net/ LUnix - Small but interesting multitasking UNIX-like OS for C64
http://www.mayhem64.co.uk/main.htm Mayhem Commodore 64 archive, Various C64 stuff, mostly games
http://www.mikesarcade.com/cgi-bin/store.pl arcade game replacement parts and technical information
http://www.mouser.com/index.cfm?handler=home new parts, some for CBM
http://c64web.com:6510/fotios/ New Commodore 64/128 Hardware Accessories great new stuff
http://project64.c64.org/index.htm Project 64 CBM Documentation project
http://www.prophet64.com/ Prophet64 SID Music Software and boards for dual SIDs
http://www.protovision-online.de/catalog/index.php?osCsid=ae6e60fc03209ba350323b7ec207e5cf Protovision-Online C-One, Catweasel, etc.
http://personalpages.tds.net/~rcarlsen/cbm.html Ray Carlsen's Home Page CBM repair articles
http://www.worldcatlibraries.org/search?q=su%3ACommodore+128+%28Computer%29&qt=hot_subject Results for 'Commodore 128 (Computer)' [WorldCat.org Search for 'Commodore 128 (Computer)' books at a library near you
http://www.vesalia.de/e_retro.htm Retro Replay for sale from Germany
http://www.particles.org/forum/index.php?sid=e1509d7149bf2cba2b8db49530119c21 Retro computing forum
http://www.baltissen.org/newhtm/10to816.htm Lots of interesting hardware projects
http://staff.washington.edu/rrcc/ schematics from Ray Carlsen
http://www.sweb.cz/siliconcave/portal/cbm.htm SiliconCave COMMODORE C64 scene
http://codebase64.org/doku.php C64 source code wiki
http://www.kludgesoft.com/c64/64.html Strobe's c64 Stuff unzip, etc.
http://www.style64.org/index.php?cid=rele.dirmaster Demo scene group
http://www.softwolves.pp.se/cbm/syspd/d64/ User group disk archive
http://www.fairlight.to/docs/text/tass_docs.html TASS Docs C64 assembler
http://www.c64.org/ The c64.org portal
http://ca.geocities.com/sjgray@rogers.com/CBM/cbmxfer.html The CBMXfer Page front end for CBM4WIN and other transfer utilities
http://www.floodgap.com/retrobits/ckb/ The Commodore Knowledge Base Searchable database – not much here yet (673 articles so far...)
http://www.devili.iki.fi/ old computer love site
http://www.csbruce.com/~csbruce/cbm/lrr/ The successor to Big Blue Reader
http://www.macharsoft.co.uk/ Programming in COMAL with UniComal http://www.ffd2.com/fridge/chacking/ The Official Unofficial C=Hacking Homepage
http://thepiratebay.org/search/commodore/0/3/100,200,300,400,600 The Pirate Bay - The worlds largest BitTorrent tracker, 'Commodore' search
http://www.floodgap.com/retrobits/ckb/secret/index.html The Secret Weapons of Commodore! Exhaustive history of unreleased Commodore products
http://sta.c64.org/scdoc.html The Star Commander, Version 0.82
http://www.csbruce.com/~csbruce/cbm/transactor/ The Transactor Online Archive page scans and full disk collection
http://www.fairlight.to/ The World of FairLight C64 scene group
http://members.optusnet.com.au/vortex69/64EMULATES/64EMU.htm Commodore 64 emulates other computers
http://www.classiccmp.org/pipermail/ Usenet Classic Computing Archives
http://home.comcast.net/~kkrausnick/c128-vga/c128-vga.html Using the Commodore 128 Computer with a VGA Monitor
http://www.vintagecomputer.com/#ER Vintage Computer Store Some C64 stuff for sale, sometimes
http://starbase.globalpc.net/~vanessa/hobbies/index.html interesting C128 hacks
Just found this site with some nice tools and the software for a variety of C64 EPROM programmers. Kind of a rare thing.
http://www.cascade64.de/drivers3.html
Detailed information on interfacing with the C128 Basic interpreter from ML, translated from the German 128'er:
http://members.tripod.com/~rvbelzen/128intpt/index.html
I don't know if there's anything here that isn't anywhere else, but I found an archive of stuff I wasn't aware of before, and it seems to at least be organized differently than anything else I've seen, so I don't think it's just a mirror:
http://www.filegate.net/cbm/
Anyway, the directories that start with '6-' are for the C64, the ones that start '8-' are C128, and the ones that start with 'g-' are for GEOS.
I'll let you know if I find anything new there (new to me, anyway).