I just recently ran across an article about the PSP to Aibo controler. I know everybody has heard of this hoax. But perhaps not everone has heard of someone actually making it work. Of course this has been done with a Hacked Firmware but it does present some interesting ideas.
The PSP also has great robot control potential as a Universal Infrared Remote.
Given Sony already seems to have hinted at a new generation 2 PSP, I would think the price and availability of the PSP would become more attractive to the hobbiest market. Just don't start stealing little Juniors handheld while he's sleeping.
Good luck with your Bots everybody...