Apple's iPhone 4 "FaceTime" gets a free app called "iChatr," that like Chatroulette, the faddish video chat service that lets you talk to random strangers, allows iPhone 4 owners FaceTime with other random iPhone 4 owners. Like FaceTime itself, iChatr requires you to be connected to a Wi-FI network.
There's no logging in with iChatr, you just jump straight to a split-screen display with your camera on top and your chat partner's camera on the bottom. Don't be alarmed when you don't see Chatroulette's familiar "next" button on iChatr. You can still "next" people, you just have to swipe over their image at the bottom of the screen.
Download: iChatr (iTunes link)