Google Wave
What is google wave?
Watch here:
Google Wave is "a personal communication and collaboration tool" announced by Google at the Google I/O conference on May 27, 2009. It is a web-based service designed to merge e-mail, instant messaging, wikis, and social networking. It has a strong collaborative and real-time focus supported by extensions that can provide, for example, spelling/grammar checking, automated translation among 40 languages, and numerous other extensions. Initially released only to developers, a "preview release" of Google Wave was extended to nearly 1 million users beginning September 30, 2009.