This is a little compilation of other resources that I thought should be here.

UNIX Resources
• vi Cheat Sheet - You need to use vi but can't remember how!

Windows Resources
• COPSSH - If you hate full cygwin installs as much as I do, but need sshd on a windows machine nonetheless, then this is the solution. Good for tunneling, sftp and whatever else you may need sshd for without all the extra crap. This is basically OpenSSH and a minimalist set of cygwin libraries.
• PuTTY - This is like the ONLY telnet/ssh client for windows. If you aren't using this, you're wrong.