This actually scares me a lot about dropbox. I've had clients share very sensitive documents and code via an emailed dropbox link. If you are in charge of security, dropbox is a data-loss prevention nightmare. It's too easy to share things. I can only imagine what kind of IP dropbox has access to.

The value for me far outweighs the current security worry.

None of my data is life and death critical - so I dont fret too much about security.

I expect that Dropbox will get better, and the service is just invaluable to how we work.