Here are some personal favorites. I believe they are all still streaming:
Documentaries:
Life 2.0 - follows a few people that are obsessed with Second Life.
All This Mayhem - about the Papas brothers (professional skaters from down under)
The Imposter - totally weird and messed up. You can't believe it's a true story.
Horror/thriller:
Old Boy - the original movie, not the remake. Simply a must watch if you like horror/trillers..
Thankskilling - Campy, and amazing.