I stumbled across this blog last week, right after it started. So far, it has covered Homeopathy, the mercury-in-vaccines thing, and today, magnetic healing. Some of my "favorite" quack topics, in an entertaining, in-depth, and well-written manner. I hope they keep it up.
http://www.sciencebasedmedicine.org/
(Mods: I wasn't sure if here, Tilted Life, or Howto was more appropriate. Since I didn't have anything in particular to discuss from the blog, it went here. I don't mind if you move it)