[JoshTriplett]

> I was under the impression that Dropbox can't "see" your files in the sense that they wouldn't be able to tell what was inside a document or photo; it's all supposed to be encrypted.

No, that was never true. In particular, that would break Dropbox's model for deduplication, as well as their web clients, and various other things. If you're looking for an end-to-end encrypted solution, Dropbox was never it.

[nwh]

To expand on that, mega.co.nz does attempt to do encryption end deduplication. Each file uploaded is encrypted with it's own hash, and the hash is stored in the users encrypted account. The idea is that if two users upload the same file they will have the same hash and be deduplicated. It's not particularly secure or private in their implementation, but it can certainly be done.