If you're like me, you have (1) a TV that only has composite, RF and S-video inputs, and (2) a Commodore video cable that predates S-Video, and thus brings the Luma/Chroma lines out to separate RCA plugs instead of having them unified in a mini-DIN-4. Up until yesterday, I thought the only way to connect the two was to make your own adapter, but it turns out a 6' cable with RCA plugs at one end and a male mini-DIN-4 at the other is available for about eight dollars from a local electronics retailer. Some digging produced this link: http://shop.vetcosurplus.com/catalog/product_info.php?cPath=37_38_44&products_id=132
They have a 12' version too, but I don't see that being too useful unless your Commie and your TV are really far apart.
A couple of F-F gender changers for the RCA plugs and you're all set!
G.
I bought an S-video (male) to RCA luma and chroma (female) cable at a local electronics shop for $5. While they're not exactly common, they shouldn't be that hard to find.