- Linux Shell Scripting Tutorial, I am a big fan of nixCraft site for its quick tips on *NIX. I found this one easier to navigate and understand than BASH programming - Introduction HOW-TO or Advanced Bash-Scripting Guide
- TextMate Basics Tutorial, a nicely written piece that walks you through the basics of TextMate, I especially like the organization of the shortcut keys
- Git Reference, a much shorter quick guide than Git User's Manual (too long and boring)
Again, reading a lot is not as useful as coding a lot. But if you don't use it for day-to-day work, you might easily forget many tricks. So, some quick references are handy in this situation to bring you quickly up to speed.
