I would try getting Linux on it and try to use it as a media extender, or thin client, or WiFi based remote, or something along those lines. It uses an Arm9 based professor at 300mhz, so anything more than a light webserver, dosbox machine, or embedded system is likely too much for it.
You could try putting windows 8 for arm on it when that comes out, but that would be for lulz, nothing more.