Opera 10.50 is right now only available for Windows, and the Linux and Mac OS X versions are still in the beta stage. Opera 10.50 also features a revamped UI which makes full use of Aero effects available in Windows Vista and 7. It also supports Windows 7 jump lists, and tab previews.
The browser also features one of the best implementations of privacy mode in the browser. unlike the private browsing modes in Firefox and Chrome, Opera allows for private mode browsing on a per-tab basis.
You can Download Opera 10.50 from Opera website.