I just signed up for a DropBox account, so I can more efficiently put some of my "stuff" in the "cloud." I haven't tried it out yet, but as one who cares about such things, this one phrase in their Terms of Service was all the endorsement I needed:
It's pretty sad that a business has to explicitly inform its customers that it won't just randomly hand over their information to law enforcement. But given the actions of Amazon, Visa and others, it has become necessary.
Anyway, for taking what has become an uncommon principled stance on this, I am wholeheartedly recommending them... even thought I haven't yet tried out the service.