Heh, I hate that "feature", mostly because I can't see the titles of the tabs when I have like 30 open and I have to cycle through them to find them.

By the way, Firefox also has the "tab doesn't resize or move until you move the mouse away", and it's pretty useful indeed...

Chrome has the best "Incognito" mode, though... after Opera's "Private tab" feature, of course :-).