PSP was suffering from game drought last year, but it is back with good number of titles:

Resistance Retribution: A fun shooter game which even has multiplayer. Good to have a resistance game on the PSP

Locoroco 2: If you liked the cute game LocoRoco, dont forget to play this one

Patapon 2: Same goes for this, Pata pata pata pon, pon pon pata pon!

Rock Band Unplugged: This is a must have game for PSP owners, rock band fun on the go is awesome!

Dynasty Warrior's Strike Force: Havn't played it much, but the graphics and gameplay seemed fun

Tenchu Shadow Assassins: Stealth gamers should like it

Prinny: 2D platformers still have their charm, prinny is well done, quite difficult though

Those are only the few released ones, the upcoming lineup is just crazy:

Motor Storm Arctic Edge

Little Big Planet

Gran Turismo for PSP

Jak and Daxter - The Lost Frontier

Metal Gear Solid Peace Walker

Soul Calibor Broken Destiny

Silent Hill Shattered Memories

Duke Nukem Trilogy
GTA Chinatown Wars
Assassin's Creed Bloodlines
Resident Evil Portable
Tekken 6

Note there will be more multi-platform games like 'Army of Two - The 40th Day', which I am not mentioning here. Also note, I haven't even mentioned the RPG's here, since I dont play them, there are good number of them too to be released. Thank you PSP devs

Hey guys, I own a PS3, PSP and finally a PS2. Check it out on my table

Playing God of War of course, the game I wanted to play since ages

Black is good too

GTA Liberty City Stories

Man they are all good. Most PS2 games support Widescreen, so doesnt look flat on the HDTV. This is the best console of history clearly, as I am sensing that after trying games after games Adios

Did you try out the Battlefield Heroes beta? Gamespot is giving away beta keys, chk out here. The game looks quite cartoonish. Gameplay is fun too, there are planes, tanks etc. Try it out