As an example these are some of the things I always do when starting a new machine:
- Install 'Visor' - gives you an always available HUD style terminal window via F1.
- Install 'Clix' - run a million system customization command line instructions.
- Install 'Default App' - self explanatory.
- Set 'Terminal.app' to open and be hidden automatically on login.
- Install 'Inconsolata' font and set it as default font for Terminal and Text Edit.
Only after those basic steps are taken can I start in on the more personal stuff.
So, what are the essential steps you take when faced with a blank macSlate?
NB: Yes, this question is inspired by @Roddy's question targeting the Windows platform.
UPDATE: This is great, thank you! Some very interesting answers so far.
Concrete Results: I am now a MacPorts convert, and my Terminal uses standard word left, word right, key command behavior...
UPDATE 2: I forgot to mention Charles, the greatest debugging http proxy app in the world (IMHO). It's shareware and 100% worthy of the name.