The exciting thing is Opera Unite has initiated change in web browser landscape from just a web client to web service browser.
Opera Unite will allow developers to write custom application called as Opera Unite services allowing peer to peer communication in between multiple web browsers. So basically anyone can write Opera Unite services without need of third-party servers. So all kinds of file sharing, photo sharing, games, web services right from the browser. And Opera Unite is available on Windows,Linux/Unix and Mac OS. Pretty cool?
Read Introduction to Opera Unite for more details.