This article is an intro to the screencast the author has created and is selling for $15 at https://workshops.thoughtbot.com/pages/tmux . It is linked to at the bottom of the page. I really enjoy learning about new pieces of software but in my personal opinion $15 for a 26 minute screencast is kind of pricey.
The screencast covers a lot of things, including workflow, key bindings, and tweaks to OS X to make you a faster developer. If you save ten minutes a day, you'll have made up the cost of the screencast in a day or two - which, in my opinion, is well worth it.
