I wonder whether the tab bar can be moved to the bottom—that's the way I have it in Opera and Firefox (quite possibly because my Windows tab bar is also at the bottom).
One thing I miss in Google Chrome from Firefox 3 is remembering the zoom state per site.
For example, Facebook and Wikipedia always looked too small to me, and I was always zooming up; when I upgraded FF to version 3, I found that it remembered the zoom state for a given site, so all windows from that site would have the new state!
A bit unexpected at first, but a good idea.
I also miss the custom search keywords -- I've got used to typing in, say, "en Foo" to find the English Wikipedia article on "foo".
This worked in both Opera 9.5 and FF 3.