Drop Box woes... read if you use Dropbox:

Dropbox authentication: insecure by design

http://dereknewton.com/2011/04/dropbox-authentication-static-host-ids/

Dropbox Bug Made Passwords Unnecessary, Left Data At Risk For Hours

http://www.huffingtonpost.com/2011/06/21/dropbox-security-bug-passwords_n_881085.html

Dropbox under fire for security concerns

http://www.tuaw.com/2011/04/19/dropbox-under-fire-for-security-concerns/

Top 10 Dropbox Alternatives to Securely Sync and Share Files Online

http://techpp.com/2010/07/05/dropbox-alternatives-sync-files-online/