I'm looking for a good recommendation for a WebRTC app for video chat, that's essentially peer-to-peer cross-browser that can be used on mobile devices as well as PC's
It's not quite ready for primetime yet I don't think (last time I checked). I'm working a website app to do this myself but due to lack of browser support, I've moved on to other projects for now. Try checking on this again in another year I would say
Hey..my apologies. Web RTC is actually getting closer. check out http://www.webrtc.org/ . I haven't messed with it yet, but looks like you can use it on current Chrome, FF, Opera. Last time I had checked it was only working on Chrome dev browser. Here's a sample client app https://code.google.com/p/libjingle/source/browse/#svn/trunk/talk/examples/peerconnection/client