Firefox 2 was released on Tuesday, and I can safely say, "Go ye hence and download the same!"
Really, it's the bee's knees among browsers - a huge step up from 1.5.
(One small strangeness, easy to fix but equally easy to waste hours on unless you know: if you have McAfee SiteAdvisor installed, just a few of you may find Firefox won't start. First, start Firefox in its own safe mode (all add-ons are temporarily disabled) (you'll see the link in your programs menu) and then you'll need to ensure you have the auto proxy configuration script disabled. Sounds scary, geeky even ;-) Don't worry - McAfee have a handy page explaining how to do it, step by step. Piece of cake when you know how, and everything works perfectly afterwards.)