Without a doubt, here is the best forum on the planet for home brew wind power. And a nice bunch they are:
http://www.fieldlines.com/index.php?board=5.0
There's a little bit of everything, but the common/favorite kind of build is a permanent magnet alternator with a cast resin stator.
tons and tons of posts and info.
http://www.fieldlines.com/index.php?board=5.0
Don't underestimate the need for a good tower. Tall enough and strong enough. It
should be ~20 feet taller than the nearest building/tree to get the turbine into that nice smooth undisturbed air.