Someone once suggested to me an encrypted text file + dropbox. You could use pgp or gpg for encryption. Also Vim 7.3 has blowfish encryption: http://vim.wikia.com/wiki/Encryption
Obviously an app has the potential to be more convenient and user friendly. But a text file is a very flexible solution.
Did you ever have a desktop side implementation, maybe a chrome extension? I'm a longtime 1Password user, and would have to say the ability to use the same password manager on my iPhone and Mac, sync'd via Dropbox, is a big reason for that.