Snowl: Unified Messaging In Your (Firefox) Browser

Mozilla Labs announced a new project today called Snowl. It is an add-on for Firefox that aims to bring all of your messages together in one place, whether it is from email, SMS, Twitter, or RSS/Atom feeds. The project right now is an early, buggy prototype that only supports RSS/Atom feeds and Twitter. So that is nothing special.
But once email and SMS is folded into the mix, it could become a very powerful messaging center, built right into the browser. It will allow you to search through all of your messages and feeds, both public and private, no matter where they originate.