Check out firemeganmcardle.blogspot.com. Megan McArdle is a contributor and blogger for the The Atlantic. She is a libertarian blogger who I link to quite frequently as I happen to be a fan. Anyhow, some bloke or assortment thereof (one of the posts indicates it might be an ex-boyfriend or friend of an ex-boyrfriend) have created a blog with the sole purpose of dogging her. Now, this is a bit pathetic but nonetheless an excellent example of the niche blog. I would imagine its existence is quite flattering. If there were ever a blog dedicated to harassing me I would be tickled, but first I need readers.