Textmate, although there are a few apps in the win env. that try (E-TextEditor is great). Quicksilver/Launchbar - This is a biggy, I used to use Enso by Aza Ra

Textmate, although there are a few apps in the win env. that try (E-TextEditor is great). Quicksilver/Launchbar - This is a biggy, I used to use Enso by Aza Raskin back in the day before I switched. Ultimately it was these two programs that did it for me. Those and a terminal.