Ah, for those of you who have wanted to try out the latest Firefox 3 Beta all along but were hesitant because they feared it screwing with their local data (current profile etc.):
PortableApps offer the Firefox 3 beta as a USB-stick-ready package that won't touch anything on your local computer, making it safe and fun to try out for anyone who's feeling curious:
Mozilla Firefox®, Portable Edition is available packaged with Mozilla Firefox 3 Beta 3, allowing you to test all the latest features in the upcoming version without disrupting your current Firefox installation.
Have fun beta-testing!