Opera 9 is now available for downloading. It is out of beta. I upgraded at home last night. Adds some bells and whistles, tabbed browsing which it has always done. Hover on a background tab and it pops up a thumbnail of the site lying underneath. Some other stuff, I guess too, I didn't really get into much exploration yet.
It's still free, btw. The widgets (small web apps that contribute to the browsing experience, much like Extentions in Firefox) look pretty cool.
http://www.opera.com/
Feature description here: http://www.opera.com/products/desktop/