Amazon Auctions - Auctions from Amazon (the bookseller)
Auction Fire - Free Auctions - Online Auction Site
Bidville Auctions - Better Prices
CompUSA Auctions - Refurbished Computer, Printer, Scanner Auctions
E-Bay - Worldwide auction leader
Overstock Auctions - Buy, sell and network from Overstock.com
UBid - I know nothing about this site
Yahoo! Auctions - The world's second biggest online auction service