Albino BlacksheepGoogle Wave
Google Wave is the next generation of email, messaging and online communication in general. It's only possible today because of upcoming technologies such as HTML5. In fact, Google Wave won't even work with Internet Explorer. Only a modern browser like Chrome, Firefox 3.5+ or Safari can handle it.
Basically, the concept of Google Wave is to create a document file from real-time conversations that can be expanded upon and replayed at any time. These conversations or "waves" include real-time typing (see typing as it happens), drag-and-drop attachment sharing, private side-conversations and more.