I should've posted this early this morning, but what can I say? I've been busy. Follow this link, select a mirror, download, install, and you're off and running with the official Firefox 2 release. Built in spell checking (on the fly), drag-n-drop tabs between windows, undo closed tabs (with history), new default theme, better bookmarking, improved memory management, search bar management, and much more. That alone should be reason enough to upgrade.
P.S.: It still has yet to pass the Acid 2 test.