It's unfortunate when most are so mesmerized by great but incomplete magic that the magic creators are unwilling to conjure something even more magical to include safety like client-side encryption.

Reworded for the downvotes: Don't punish users because most may not even be aware of the lack of security in Dropbox by not using client-side encryption. If it's too difficult to explain, then it's time to go back and address your implementation of the product. Security through simple ignorance of a known deficiency is just disappointing. Maybe it only affects 1 out of 10 users who trust the safety of their stored password lists or similar documents, but businesses hopefully are more demanding.

And just a note...I do like Dropbox and use it everyday(for non-sensitive files).