WSOP for the PSP is pretty good. Nice clean display, graphics are good enough. Not sure about the AI yet- but won't matter too much if you're playing other humans.

It doesn't get very good reviews generally, but I'm not sure why.

Better than World Championship Poker (DS) which I had for a while before selling DS to get PSP.

Regards,
Ian

PS: You may be interested in "Stacked" when it comes out for the PSP. It is claimed that it will have the best AI for a console game (possibly using the POKI AI system)