Email marketing is nice because it's super cheap. I know some guys in my area have done it but it seems like it tends to be the newer/desparate crowd.

I've never done it, mainly just because I don't want to be a 'spammer' and I think there's the possibility of annoying some people.

There is certainly a case to made for doing it though. Let's face it, you could annoy someone and they won't call you... But, they probably aren't calling you anyhow so some would say all it can do is help.

If nothing else, it's getting your name out there.