about the games...
i think daxter is pretty solid. better than ratchet and clank imo, which while good, doesn't quite live up to its console counterparts (the controls are ill-suited for the nub they call an analog stick!). also, dead head fred is this pretty cool action/platformer game with a decent sense of humor. it feels sort of like PSYCHONAUTS though i can't put my finger on why, exactly. maybe it is the dark sense of humor thing.
lumines is actually a really cool game, and i don't even like puzzle games, so i'd say that's also a necessity. i was expecting it to be boring but it's 1) really accessible and 2) has a fair amount of depth and strategy involved, so i'd say it lives up to what people say about it all the time. it's the tetris to the psp's gameboy.
people say wipeout pure is an incredible game, and maybe it is and i just suck at racing games, so idk. i've played nfs carbon and i found it easy and sort of cool, but wipeout is HARD. like, i can't play it. if you can though, give it a go. people rave about it.
uhhhh fft is an obvious choice i would say, unless you've played it recently. the lag isn't all that bad, and the cutscenes and dialogue changes are, for some, positive. my first time playing it was for the psp and i loved it.
i haven't really played field commander too much, but marcus said it is a really good game so maybe if you're down for a 3d, seemingly more in-depth version of advance wars, that would be a good idea. i would also give the prince of persia ports a go, as they're generally decent ports and the fun of the series remains intact. maybe not if you've played the original console versions, but if you haven't, check those out.
and as far as FLUFF shit goes i have a few ideas. gta: vcs and tony hawks project 8 are uh, good for what they are. if you're bored and want some kind of mindless action the psp gta are pretty faithful to the series so you can rough up a trick and put it right back down if that's your thing. same with project 8; it's easy to pick up and put down, and stays true to what makes the games acceptable, so maybe you'd enjoy it.
ALSO the syphon filter games out for the psp are surprisingly alright. so if you want to shoot shit that and the second coded arms are good. actually the second coded arms is relatively mediocre mostly, but i'm impressed at how tight the game feels, as the psp's controls are pretty limiting for an fps control scheme. i mean, it helps that there's no flashlight/grenade buttons, and the only two actions you really need are jump/shoot, but still. it's good to know they can work with what they've got and still churn out something decent.
you should definitely hack it as soon as possible though because games are fucking expensive and it's so much easier to download that shit.