Firefox 2.0 is scheduled to be released this afternoon. The install files have already been found on Firefox mirror sites if you want to get the jump on things, otherwise just wait a few more hours.
Among the new features is a spell checker used on all textarea fields. If you misspell a word a dotted red underline appears. I think that’s brilliant. If you right-click on the misspelled word Firefox will give you a list of possible replacements. Tabbed browsing has been updated a bit with the ability to undo closing a tab. The history menu also has a recently closed tabs section now.
Looks like a solid release. Still miles ahead of IE.