They have only just started putting more focus into games where sony is having trouble with. They had no problems on the ps2, after 2 years surely the psp should start getting more games. Thankfully the last 6 months has been good with daxter etc. and the newly announced god of war for psp.
The psp is still good for a few more years yet and hasn't reached its full potential.
P.S. I am a nintendo fanboy but I think sony have got a nice kicking up the bum for the psp.