There's always https://mega.co.nz/

Wuala.com does aswell (not mentioned in parent). They are a Swiss company and don't have a lot of traction in the US.

Spideroak does. Their GUI is really awful, but the commandline python script seems to work well.

SpiderOak claims to.

Why are you trusting any of them to do that anyway. Ecryptfs is your friend.