Back on topic for the 2.0 Update, overall I'm enjoying the improvements.
The user interface seems a lot snappier and the native messaging client is awesome (love how it integrates everything into one "Inbox" although it's nice you can filter this as well). App World is definitely improved from the earlier OS. Oh, and I can't forget about the Swiftkey keyboard - way better than the older keyboard. Swiftkey was one of the best 3rd-party keyboards on Android devices, and it's nice to see it here on the PlayBook. If you type in "Ben" you'll see the first suggested word is "Medlock" - the CTO for Swiftkey).
As for things I think still need to improve, the browser is the most important. We still can't edit or sort bookmarks - which is something that should be standard. Hopefully we can start seeing other Android browsers working on the PlayBook (Chrome, Dolphin HD, Opera Mobile). Yes, the browser handles Flash & HTML 5 fine, but bookmark management leaves a lot to be desired. I also feel they took a step backward in the video player. With the old OS, incompatible video files wouldn't appear in the player, but under 2.0 they do (and generate a "File not supported" error upon playback). Finally, we should be able to delete calendar entries for specific Facebook events - can't find a way to do that unless I disable syncing all such events.
I can't comment on the Bridge enhancements as I don't own a BlackBerry smartphone, though this also makes me wish BBM was standard. At least that one I knew wasn't going to be added to this update before I bought the PlayBook.
Overall, nice improvements, and I can't wait to see what's next.