ING Direct app that used its API, Bump Technologies has developed its own version of the mobile payments software, enabling phone-to-phone "Bump" transactions using PayPal. Yes, PayPal. That minor processing detail aside, the service appears to offer a fun solution for simplifying the fairly painful process of paying the check at group meals, or splitting a tank of gas with a friend. Both you and your bud need to have the app installed before you can beam that green, and there's no option to send payments remotely, though you could always use plain ole vanilla PayPal for that. The app is free, and if you have a checking account linked you won't have to deal with any fees. Bump Pay is iOS only "at launch" (read: it could be making its way to Android as well), so for now you'll need to bump the App Store to get folks paid.