I've been meaning to do this for a while, but never got around to it, so when I saw this on 4 Guys, I thought I'd just link to it. It'll save me some time.

Anyway, here's a nice introduction to NAnt. There's a lot more you can do with NAnt, but this is a nice start that'll give you the idea of how to do the basics. If you want ideas of some more complicated things you can do, take a look at NAnts own build file. It is a wealth of information and examples.