I just found this today:

Auction | Cheap TV laptop ipod auctions - bid & win on Swoopo

It's basically a bidding site that sells things at (seemingly) really cheap prices. The auctions always seem like they're about to end (eg. ten seconds left), but if you place a bid the price and the time left both increase.

The clever part: Each bid costs $0.75 to place. They sold a Toshiba laptop for about $43.57, but the price increased by just a penny per bid. Therefore: 4,357 bids were placed (making $0.75 each), but the person who actually wins the laptop really feels like they're getting a deal.

I wish I'd thought of that...