My 2.00 observations on a fullscreen/widescreen selectable 480i TV.
-There is no new Flash player, or at least not a new version. Youtube videos seem to have slightly better synced audio and video, but that's about it. I still can't use Flash content on a number of other sites.
-Themes act funny when you switch between fullscreen and widescreen. I had the new classy pink theme set up in fullscreen, but when I changed to widescreen, the background image was pillarboxed on the left and right. (Letterboxed, but vertical.) After I changed my theme to the original one and then back to classy pink, I got a 16:9 background image.
-The news ticker thing at first said something like "Welcome to the PSN news 2.00" or something, over and over. After I selected US under the new ticker thing, it started saying ticker stuff. I don't like the ticker, so I turned it off. Thank goodness you can.
-The format utility now gives you options on formatting devices other than the hard disk. It lets you format memory stick type stuff and USB memory devices. I don't remember this being in previous firmwares.
-Listening to streaming music over Windows Media Connect while trying to go to a webpage with an unsupported Flash thingy will CRASH YOUR PS3. The system just froze, and the only thing I could do with it was eject the game that was in the drive. The power button on the front of the system did nothing. I had to reach around to the back and flip the switch to turn it off and back on again. It doesn't seem like the crash had any lasting effects, though. I don't know if listening to streaming music while trying to open a webpage with a supported Flash thingy will crash the system, but I'm not gonna go ahead and find out.