Deb Richardson has posted a pretty comprehensive mock-up and concept of a new bookmarking system for Firefox. I think it looks really awesome, though one of the best thing about tagging is that it comes into it’s own when it is working at a scale bigger than on a personal level.
The centralised service also sounds really awesome. However I can see alot of problems with the learnability of this interface.
Anyhow, I hate to play the Devil’s Advocate all the time. It looks good, keep up the good work Deb.