Word is FB won't work still and that's a issue with FB's code, browser goes to media net but you can still goto any site using Menu > Go to. A lot of apps still aren't working but the radio code has been improved as well as the browser. I'm still waiting for another leak or 2 before I jump forward.
I too think that I will wait for a more stable release. Shape Services gave me a beta copy of their IM+ All in One Messenger to test with the new 5.0 OS, but I really don't want to go through the hassle of installing this then taking it out just to confirm.
I'd use it, but I like to have my FaceBook at hand....more so during the Stanley Cup Playoffs.