Peerflix.com
Netflix meets Napster meets eBay according to this New York Times snippet (registration required):
Dan Robinson, however, thinks trading movies with other DVD owners on the Web is better than hoarding them. Mr. Robinson is the founder and chief executive of peerflix.com, a new site that seeks to blend two trends: online DVD rental sites like Netflix and music-file-sharing services like Kazaa.
Peerflix users maintain a list of DVD's they want and post a list of movies they own that they are willing to trade. Once a member makes a commitment to send a disc to a fellow user in a Peerflix prepaid shipping envelope, that member will receive a disc or discs from other members. (Some DVD's are worth more than others, based on factors like popularity and retail price.) As in a file-sharing network, Peerflix manages the flow of content; traders do not select their partners.