Doesn't anyone else see the potential benefit to this? I'd love for the URL to take a hike and have a simple keystroke provide me with a gnome-do type command line. The default could be for a google search, whereas tags could be used to pick from bookmarks.
Putting the tabs at the top-level of the browser was a great idea and that came from Chrome; this could be a good "feature" to put in, provided they execute it properly. The only thing I really use the URL bar for is search anyway.