I can recommend some movies, but everyone knows the PS3 has......
har har har har har.
In all seriousness, I'd recommend the Uncharted series first and foremost. Beyond that, it depends on your personal preference, but unless you're easily amused(like, cymbal-banging monkeys enthrall you), I wouldn't recommend Heavy Rain. Maybe I'm a snob or something, but the massive gaping plot holes, terrible pacing, bad voice acting, and completely throwaway characters(NAWMINJAYDEHN) really ruined the experience for me.
Other good PS3 games include Killzone 2(it's a first-person shooter without obnoxious set pieces, that alone makes it a godsend), Demon's Souls(more Castlevania than Lords of Shadow), Infamous, and pretty much any multiplat.