I have been using Firefox 2.0rc3 for the last couple of days and I am very impressed with it. Not too much has changed from version 1.5, it is just cleaner and better crafted. Whilst not revolutionary it is certainly a very worthwhile upgrade for anyone who uses Firefox (especially if you are still on version 1.0). And for those of you still slogging away with Internet Explorer forget the upcoming version 7 and just make the switch to Firefox, you will not regret it.
The best new feature is the inline spelling checker. It spell checks any text input you type into forms and provides spelling suggestions in a user-friendly manner. What is even better is that new dictionaries such as Australian English can be loaded as Firefox Extensions. That means no more silly spelling mistakes when using online forums (resorting to Web-based spell checkers is just painful). Fingers crossed that in version 3.0 we may see a Word-like grammar checker although that maybe a little tough for a Web-browser.