Making it all the more confusing, the Windows version of Opera 10.50 has been updated to beta 2, while the first Mac beta is out as well. Linux users will have to wait a little bit longer though.

So we have to betas on our hands today, first there is the second beta for Windows which should show signs of maturity. Much of the focus went it to polishing the new skin (which looks nice on any Aero capable Windows), stability, memory and performance. You can read more about the individual changes on Opera Desktop Team's blog, found here.

The more interesting build is the one for Mac, as it contains new stuff compared to Opera 10.10. But before we start it should be noted that a PowerPC build is not available, but will be in the future. Ok, now that's out of the way (who has a PPC anyway?), the Mac version has gotten some love like the Windows version as well. The skin has been updated to contain a unified tool bar while using Cocao for everything you can touch and see. Other new features include support for Growl notifications and multi-touch gestures.

If you want to try something new, or see how well Opera adheres to the Mac standards of GUI-awesomeness, you can try the new beta, just as long as you buy Steve's iPad.