Customizing IRB, 2010 edition. IRB customization with wirble, hirb, awesome_print and a few others choice libraries. What makes Iain’s .irbrc so awesome is the way it handles loading of dependencies (which may or may not be available).
A few git tips you didn’t know about. Guaranteed to make you a Git Ninja, or at the very least, much more productive with the command line.
Terminal Tips and Tricks For Mac OS X. Just what it says on the label.
Awesome Screenshot: Capture & Annotate. This extension (Chrome only) makes screen capture and sharing so easy.
Incidentally, screenshot of the New revised release calendar.