- provides a trackpad
- or more (user configurable) buttons
- or a low power charge indicator
- or just more screen space
- and an easy way to connect to a bigger screen
- and more USB ports (500mA full size 1.1/2)
- and another SD card (could be used for backups?)
- A way to charge your Pandora on the go
- keeps the screen at a nice angle
- USB slave to another computer
- perhaps host/slave mode switching
This is here not because it is particularly related to the P2, but because it probably counts as spam in the same way.