I'm about to rebuild my Macbook - new SSD, upgrade to Lion, etc. I have a bunch of great tools installed now that make me very productive ... vim w/ config settings, [ack](https://beyondgrep.com/), [Homebrew](https://brew.sh/), [Node.js](https://nodejs.org/en/#download), [underscore-cli](https://github.com/ddopson/underscore-cli), etc.

I'm starting this question partly so that I can record the setup steps and tools that I myself add back. But I also want to open it up to the community... What tools do you use on your dev box? What utilities and customizations do you find indispensable?