Paypal's Osama Bedier announced that Rentalic and appbackr are the PayPal X Developer Challenge winners today at DEMO Spring 2010. Over 650 submissions were reviewed by the community, with the final winners selected by Pierre Omidyar, Scott Cook, Scott Thompson, Mark Andreessen and Roelof Botha.
First-place finisher Rentalic faciiltates peer-to-peer renting. Neighbors and family rent to each other, and transactions (including security deposits) are processed via PayPal. Like Neighborgoods, Rentalic can also be used to 'share with your friends to either save or earn money.' Runner-up appbackr is a wholesale marketplace for iPhone applications.
Bedier transferred cash portions of the $150,000 prize (Matt Marshall: "How much is the fee on $50,000?) with an iPhone bump. I was psyched for the shoutout to Bump, since I'm also a huge fan - using a physical input to trigger digital transfers has many potential applications.