Appear.In: Hang out with friends, not with Google. Appear.In lets you set up a video chat room, send friends the link, and start talking. No accounts, no sign up necessary, just talk! Already reserved a room :)
In a perfect world all current browsers would allow the usage of WebRTC natively, but that is as always not the case ;)
“WebRTC (Web Real-Time Communication) is an API definition drafted by the World Wide Web Consortium (W3C) that supports browser-to-browser applications for voice calling, video chat, and P2P file sharing without the need of either internal or external plugins.” – Wikipedia