One thing it's doing: GrooveIP is not working well with the Gingerbread update. It had started working perfectly with Froyo a couple of weeks ago; now with Gingerbread, my voice has a lot of stutter and echo, to the point it's almost garbled. I tried it out first by calling the answering machine; if I had called someone, they probably would have hung up from not being to understand me. Adjusting the settings didn't help the problem. So, that's not good.
GPS is working much faster, as people have reported. The Android Market also recognizes that the firmware has been updated to 2.3, so a few apps I couldn't get before I can get now, including graphic equalizer apps. I tried a couple of them, but neither worked as well as the EQ on the stock music player. Oh, well. There are some apps that are still incompatible with this device, but it must not be related to the Android version. For example, Hulu Plus works with versions of Android 2.2 and above, but it still won't work with the new firmware.