Just my 2¢
ssh + tmux = Pair Programming for Command Line Junkies
A complete guide to pairing, using tools you already know and love.
Using a GPG key for SSH Authentication
One less private key to keep track of.
How to Structure a Ruby Library
Not a tutorial. Just a rundown of conventions and best practices.
How to Publish Your Own Gem
Find out the best practices, common pitfalls, and how it all fits together before you start.