Please do post more information about this project, if it does ever get started to the point, that it'd appear in Maemo's repositories. I'm very interested on this, though I have no skills for coding at all. I'd also use it for my PS3.

Funny, now that you think about it. We have PS3-software for N900 already for simulating the N900 as controller and connecting the PS3-controller to N900. And soon possibly even as microphone(/headset?) for PS3.