Steam Advantage

A Simple Setup

From left to right: portable storage tank (for water), coal-fired steam boiler, steam tank, steam-powered rock crusher, steam-powered blast furnace

Steam Drill

Drill a hole up to 64 blocks in any cardinal directions. The drill bit hurts, so don't touch it (useful as a mob grinder, though).

Gun!

The black-powder musket is a slow-loading ranged weapon (very slow loading) that can kill a creeper with a single shot (damage and reload time is configurable).

Coal-fired Steam Boiler GUI

Steam Advantage GUIs have a steam-punk vibe.