Mozilla is trying to set a world record for downloads of Firefox 3 when it comes out. If you already use Firefox, this will be your chance to get the upgraded version. If you don't yet use Firefox this will be a great time to start!
At the Firefox Download Day 2008 page you can pledge to download Firefox 3, and you'll be emailed when it comes out. While at the site, you can learn about the next version of this incredibly successful open-source web browser.