Mokimarket - Penny auctions. They're not advertising the Bitcoin logo, but see this post for more info.
Transaction Radar - Double-spend detector.
Holo Supplies - ID Supply Superstore.
Pocket Artillery - Miniature canons.
The Venusian Arts - Dating and seduction guides.
The Diaspora Project - An alternative social network. Accepting donations.
Wisconsin Maple Syrup - I'm a little late on this one, but I couldn't allow it to be missed!