I've been trying to log onto PSN from my PSP to see if I can work the remote play. However, I keep getting message that my userID or password is incorrect. I never have a problem with this on my PS3. I even reset the password and it still would not work.
I don't currently own a PSP (have one of the 3000s on pre-order) so this might be of no use, but did you register it on the PS3 first as well as any other thing on the PS3 dashboard concerning remote play?
I vaguely recall that you can't do that, at least not currently. Wifi hotspot access might be in the near future though. But once again, don't currently own a PSP so this all might be totally wrong. Have you checked Sonys PSP forums about this?