No prob - like I said, it was only an idea. I don't own either, so have had no interest in either!
I have to agree though, it might take a little more research time!
It seemed a logical link that if Yellow Dog have an "agreement" with M$ to produce an OS for the PS3, then just *maybe* they might develop something similar for M$'s other toy - the PSP. Especially seeing as Yellow Dog have concentrated on PSP game compatibility with their PS3 OS.
Does the PSP have standard 802.11? What's the chipset?
(Have you looked at the GP2X, which is a native *nix platform. Again, it's just a vague suggestion, as it too is a handheld games platform. Although it doesn't sound like you're too familiar with cross-compiling, etc. Personally, I'd stick with the Zaurus

)