In addition to that, Telltale has some pretty big sales going on. Tales of Monkey Island Chapter 1 is free for the iPhone for a limited time. Most of their iPad and iPhone games are on sale as well for $2.99. Get the full list of titles on sale from this Telltale blog post.
For PC and Mac gamers, most of Telltale's full seasons are on sale for $9.99. Once you buy a full season, you will also be eligible for the season DVD which you can get for just the cost of shipping. The complete list of seasons on sale is here.
In addition to that, three PC and Mac episodes are also free for a limited time: Back to the Future - It's About Time, Sam & Max - Ice Station Santa, and Sam & Max - The Penal Zone.