A good PSP game?

So, recently, I went out and bought myself a PSP. Do you guys know of any good games that are for the PSP? They have to be below M rating, though.
Thanks,
Zar

GTA library city

I've been largely disappointed by most games for the PSP , but if you've not got it on any other format, I would suggest Tomb Raider Anniversary- it has more longevity than other recent TR titles, gameplay's as good as it is on any other console and having played the original TR on the PS1, it was also a nostalgia hit .

...Plus it's a year or two old now, should be cheap .

...And the commentary made me laugh so hard .

StarWars Battlefront 2
Final Fantasy: Crisis Core
MoDnation Racers
StarWars Battlefront: Regenade Squadron

Super Mario

Wipeout Pulse

All ratchet and clank games. Nao!!

Metal Slug: Anthology
Metal Slug XX
Crash Tag Team Racing (better cars than the PS2 version IMO)
The Sims 2 (has a storyline unlike the PC version)
Need for Speed Most Wanted (for cool cars)
Need for Speed Undercover (for pwnsome races)

The metal slug games can only keep you occupied for like 10 hours in total if you decide to fully explore them, but they are good. NFS MW has indestructible cops ( I am not kidding) and thus it is better if you love wrecking havoc during the later stages. Undercover is kinda meh on the car quality but the race tracks are much bigger and the cops can actually be taken down (screwing around with cops in a lamborghini gallardo while not being able to get caught is waaaaaaaaaaaay fun).

Metal Gear Solid: Peace Walker.
Awesome graphics, gameplay and story, though you'd have to have played MGS3 to understand.

Edit:
Crap, I realized the post date.

If you like racing games...get burnout legends (i think it's legends i'm not sure)