As a PortableApps Firefox user, I downloaded Beta 3 of Firefox 3. It’s pretty slick looking, and there’s a whole host of new features. I don’t like the lack of ‘go’ or ‘->’ at the end of the address bar which was useful for refreshing a page without re-POSTing, and the new location of thehome button will take some getting used to, but it looks pretty good so far!
Check it out and report back any issues to the developers.