http://www.pdai.org/forums//index.ph...ST&f=20&t=334&
This looks very promising.
Here is the main site:
http://fpsearm.psxfanatics.com/
He says that he should be able to get it to 12-15 fps in Tekken 3 and possibly higher in other 3D games but I think that using the PXA255 we should expect up to and beyond 20fps.
His testbed is an iPaq H3800.