A Simple Mashup that allows you a user to find restaurants nearby him. The user can add ratings, view comments via the web and his mobile phone(blueprint).
The coolest thing is that you can pay(Paypal X Adaptive Payments) via SMS(SMSGupShup APIs) or the mobile web. So you don't need to carry cash with you when you go out.
Because of the fact that this hack uses Paypal Adaptive Payments both the restaurant owner as well as the developer can make money :-)