PsychoAuction is a very small penny auction site. PsychoAuction auctions last 5 minutes.

Penny Purses is a small Penny Auction.  Penny Purses specializes in auctioning high end purses.

Beezid is a very large US focused Penny / View Price Auction site.  Beezid is also feature rich, including beginner auctions, why they refer to as "Cherry Auctions." Cute.

QuiBids is a very large US Penny Auction Site.  QuiBids has 1, 2, 5 10 and 20 cent auctions.

Wavee is a relatively new penny auction site that has grown in popularity in just a couple of months (I'm sure you've seen their Facebook ads).  Wavee offers bonus credits for heavy bidders - to keep bidding.

Winnit is a Lowest Unique Bid penny auction based in the United States.  Winnit is currently best known for hiring Nick Lachey to act as their spokesperson.

MadBid is a popular United Kingdom based penny auction site that has gotten quite a bit of press lately. MadBid allows you to bid using your mobile phone, which is unique among penny auction sites.

Snaglo is a medium sized penny auction site based in the United States. Snaglo offers 10 free bids to new users when they make their first bid pack purchase.

Swoopo is one of the best known Penny Auction sites. Started in Germany in 2005, Swoopo has expanded worldwide to the United States as well as South Korea. Swoopo has a very large selection of items and features attracting a large number of users from all around the world. Enter promotion code fb0374 to get 3 free bids at registration.