As far as the browsing experience:

MOUSE ACTIONS!

hold Right mouse button down and click left MB... NICE! No more stupid RClick - Back garbage.

Or my Fav: CTRL+SCROLL WHEEL.... (zooming)

Also, hold RMB+mouse down and then up (all along holding RMB) (opens a link in the bgrnd)... I mean...

As far as the User Interface, Opera is miles ahead of any browser.

Just a GOOD piece of programming! Thank you OperaSoftware!

A.