If you use a mac, you need Quicksilver. Follow this tutorial and your jaw will be hanging open with amazement. You knew the mac was cool, but quicksilver makes you so powerful. Superpowers. You know those unix masters who write scripts for everything and get their keyboard commands to do everything... this will make you like that, but more powerful, and with a nice aqua interface. This just about makes me want to get a development environment set up here... but that would be approximately decades of work. It's so amazing.
Now I need a milky way dark.