The PSP is in japan at least
PSP would probably sell better if Sony remembered that it still exists.
Sony is playing a very dangerous game right now, they're trying to market three systems at once, never a good idea.
The PSP, the PS3, and the PS2 slim for people too poor to buy the PS3 (or people with negative interest in a PS3, such as myself).
My prediction on all this:
It's not going to work out.
Some thing's going to go wrong with this plan.
As far as I'm aware the only company that ever successfully managed to market two home consoles simultaneously was Sony (with the PS2 and PS1), but the PS1 had some mad gimmick and they basically marketed it for its smallness, pretty much marketing it as a portable system.