Mozilla have released the latest Alpha of Gran Paradiso, the developers preview of Firefox 3. This release contains no interface overhaul, but introduces a number of new features:
Plus more work has been done on the offline storage for applications.
I’m still marvelling at the speed improvement; I know I’ve mentioned it on many occasions, but it’s much faster. If it weren’t for the incompatability with some key extensions I’d consider it as my primary browser already!
Update: Apparently the Growl implementation was withdrawn at the last minute owing to a serious bug.