BlogMatcher

Here's an interesting site. You put in the URL of a weblog and it spits out other blogs containing similar links. As the author rationalizes:

"It's all really simple. The basic premise of BlogMatcher is that two blogs that link to the same sites share some sort of topical commonality. If you link to an article in your blog, then the chances are, you'll be interested in reading other people's opinions about the same article. Here's a case in point. If I do a search on my blog, it will find other blogs that link to sites like slashdot.org, kuro5hin.org, wired.com, Safari and guardian.co.uk. As it turns out, people who also link to those sites tend to be technically-oriented Mac using liberals -exactly the kind of people I like to hang out with. BlogMatcher seems to work because when it comes to blogs, you are who you link to. But the really cool thing is, you never really know how it works. There are so many factors, that you'll probably be surprised at the results. In most cases, you'll probably be pleasantly surprised."