GoDaddy is adding a marketplace. http://shops.godaddy.com/ Normally I wouldn’t think much of it, but GoDaddy is a big player, IMHO, so it may mean something for product driven websites.
BTW if you have such an animal, you should also consider adding www.godatafeed.com to your traffic generating schema. It’s a cool tool that can give you a presence you on multiple product aggregation locations, including Google’s.
Usually there is a Pay Per Click element, but you’re into that already, aren’t you?