I am more intrigued by the Galaxy S II, if it ever comes out.
Only time will tell. Gonna hold on to my Vibrant for a while though.
As for selling the phone, I would stay away from craigslist as it allows people to lowball you all they want, and you may be tempted to bite on their offer. Ebay allows you to set a "buy it now" price as well as a reserve, if you want. The bidding aspect of it is nice as well, competition among prospective buyers will only benefit you.
However, craigslist IS free. It's up to you, you will probably sell it faster on craigslist, just don't do any online transactions, stick with local deals. Craigslist is a haven for scammers and people trying to get something for nothing.