Look folks, regardless of how much Dropbox is cooperating with the NSA at this point, their service is clearly insecure.  People have had their (unencrypted) bitcoin wallets emptied after saving them on Dropbox.  You have to assume that if someone could compromise your security then they will at some point.  That's why everything leaving your machine should be encrypted, and you shouldn't use sites that record IP addresses (use Tor or a VPN as necessary).