Comment encfs (Score 1) 482
The trick is encrypt everything you sync in Dropbox. This can be done transparently. I use encfs and I only sync the encrypted directory to dropbox. I use this solution in my linux, windows and OSX machines.
http://www.arg0.net/encfs
http://wiki.dropbox.com/TipsAndTricks/IncreasePrivacyAndSafety
-- blue