If you're worried that you're not paranoid enough about your communications security and want to improve your OpSec, it is actually fairly easy to go "full-Sn*wden" with hardware storage of your PGP secret keys. The Yubico Yubikey-Neo and Neo-N USB tokens are a neat (and cheap) way to keep your keys locked in a hardware device rather than stored as a file on your harddrive. The hardware tokens are compatible with the OpenPGP card protocol, which recent versions of gnupg support out-of-the-box. All of the public-key cryptography happens inside the tamper-proof device, so your secret key is never decrypted in the memory nor stored on disk of your machine.