The new firefox 3 will be released today at 7:00 pm MET. This release brings over 15.000 improvements and changes. Here is an official list: http://www.mozilla.com/en-US/firefox/3.0rc3/releasenotes/#whatsnew

With the release today the mozilla foundation is trying to get a world record for most downloads of a browser after its release in 24 hours. 1,6 million user pledged to help so far: http://www.spreadfirefox.com/en-US/worldrecord/