[railsjedi]

Luckily great tools have been built for this. We use Opscode Chef and it's life changing. After an admittedly painful learning hump, we're able to completely power our sysadmin via code.

DeployButton is just the trigger button, not the missile :)

[mattmanser]

There's a market for the missile, not the button.

[dmorgan]

People also sell buttons.