To fix SSH agent forwarding, set the $SSH_AUTH_SOCK value. I copied it from my first login into my screen session and it worked fine. :-)
How to save usernames / passwords so bazaar doesn't ask for them every time. Handy.
Article on how to use a YubiKey alongside SSH RSA key based login. Bit of a hack, but it appears to work. Nice.
Article explaining how to use yubipam to enable yubikey authentication on a linux machine. However, yubipam only supports single factor auth, username + token, no additional password.
PAM module that allows offline authentication against a yubikey. Requires a key to be retrieved from yubico by sending email plus payment info, etc. Less secure than online validation. Only supports single factor auth, username + token, no password.
Script to enable a yubikey to be used with luks full disk encryption. Very interesting...
A clever pseudo-hack that allows a web site to determine if I'm logged into facebook / gmail / digg / possibly other sites based on various urls which are only accessible to logged in users. Obviously smashed by noscript... :-)
How to get custom RSA SSH keypairs into EC2. There is one region missing from this post.