We have told you quite a few times that RIM is really pushing for making the PlayBook browser a desktop class Browser. Bill pointed out to us that HTML5Test.com now has both the PlayBook OS 2.0 and OS 2.1 taking the top spots for tablet browsers in both the current and beta/development categories. It has a heavy lead in both categories. RIM is now working on improving the ancilliary features of the browser so hopefully it keeps on getting better!
Check out the stats here. Its also interesting to note that RIM is making some great headway in pushing their WebKit port back upstream so that development is even faster.