couchmanagers.com just launched mock auctions. They have something I haven't seen anywhere (fantasyauctioneer, cbs, espn, etc). That is slow mock auctions. Just like those done in the forums here at fantasy baseball cafe, you can have an auction run over a few weeks.
Not sure about their interface for real time auctions, but the slow auction interface seems to be great.
There are a few things with the New York Yankees that never change. That's pride, tradition, and most of all, we have the greatest fans in the world. -Derek Jeter, 9/21/08 -- last words from old Yankee Stadium