Windows 7 integration is also pretty tight, something my favourite browser (you know) still fails at miserably. Opera makes proper use of the new taskbar (i.e., each tab gets its own entry), has a decent Jump List, and uses Windows' Aero look where it makes sense. Opera 10.50 also comes with the new Vega graphics library. "Everything in Opera 10.50 is drawn on your screen using Opera's new, high-performance graphics library," Opera explains, "This enables super fast and smooth graphics for everything from tab switching to animation on Web pages."
The address field is smarter, too, now, so you can search through your history or the internet using your search engine of choice. Dialogs created by web pages do not interrupt your browsing experience, as they appear as overlays on tabs, so you can still switch between tabs or windows even when the dialog is still displayed.
There's more to it than that, so be sure to hop on over and take a peek. Sadly, Linux and Mac users will have to wait a while for the beta: it's currently Windows only. Mac and Linux users can download the alpha, though.