I have been about a week with FireFox 3 and I have to say I am very pleasantly surprised. I remember a friend of mine complaining bitterly at the start of the ’90s about the extravagance of the 3-d look that was being rolled out across desk-tops so it is interesting to see the Mozilla people opting for a retro look that seems to take us back to about then.
Apart from that it seems to be a well-thought through redesign of the control area at the top. The enhanced-url completion is excellent, as is the ability to pick up links and drag them into folders and the bookmarks menu.
Very smooth. Very smart. Almost no disruption. IE have a real fight on their hands.