Firmware 4.05 will have new music playback visualizers
According to Playstation.Blog, firmware 4.05 will be arriving shortly bringing new visualizers during music playback. Nothing else has been disclosed other than a tease of "other features." Some of us here use our PSP as our primary music player, so this new update will spice things up a bit.
Update: Firmware 4.05 includes two new visualizers, one if you have a wallpaper and one if you don't. If you don't have a wallpaper, the waves you see in the background are reduced to one. If you do a have a wallpaper, a water rippling effect can be seen on top of your image. Overall, very underwhelming.
