Tomorrow (and today in some places now I guess) is Firefox 3 Download Day. We're trying to set the world record for the most software downloads in a day. Do your part and sign up and download Firefox tomorrow (June 17th).
Also, I think it's the best browser around now. Here's Walt Mossberg proclaiming Firefox 3 the new browser champion on video.
UPDATE: The official download day starts at 10AM PST 6/17. If you sign up, you'll get an email with a download link... or you can just go to the Mozilla.com and get it after it starts.