One of the great things about Mac OS X from the Geek perspective, is the Terminal.app. It’s a simple Command Line Interface that exposes the Unix like operating system underpinning the glorious eye candy which Apple are more famous for.
Your mac works perfectly well without you knowing a gnats dropping about the terminal, and Mac users unfamiliar with *nix are often a little overawed when they first encounter it. But many of the more technical users love the terminal and the things they can d that aren’t available to the uninitiated.
If you are a die-hard terminal lover, then you really need to download dterm from decimus.net. It’s very simply a context sensitive terminal window with the working directory set to your current window. It appears when you press a hotkey.
For a developer using a version control system like git, using Dterm this is a huge boost to productivity.