Trusting the Cloud

Today, the Cloud is the next best thing in computing . . . at least to those hoping to make scads of money from the concept. I'm a bit leery of putting my information in the cloud. How about you?

What type of data do you trust to the cloud? Me, not much. I definitely can think of some advantages to having data in the cloud -- availability on multiple platforms and locations being the primary one. But I just haven't gotten over the thought of what the service is doing with my data. What type of mining and mapping and analyzing are they performing on my data?