Aside from the obvious (partypoker.cc has been gone since September 2003, and might just be C&D-bait), it's not a bad idea.
Developing .cc's is becomming more and more acceptable as an alternative to .com's or similar. While the key to being highly ranked ( :imho: ) has more to do with the number of links to the domain with the anchor text as the search term, as well as content and age of the domain.
In any event, yes, .cc's can be listed at Sedo. If you sell through Sedo, there is a $150 fee that comes off the top (Plus 10% of any amount that would be over $150), but really it's all about getting the name out there. Most domainers would contact you through the whois info anyway.
-Allan