Fight Splogs
At first glance, it seems like a regular blog. But look closer and you’ll see there’s something very odd about the blog’s content: It’s very familiar. Too familiar. That’s because you wrote it — six months ago on your own blog. The rest of the content doesn’t make sense: The same word repeated over and over again. There are ads all over the sidebar for products like Viagra and mortgage loans. This, you realize, is a splog, and you’re the victim.

“Splogs,” or spam blogs, are one of the methods spammers have adopted to manipulate the blogosphere for profit… But why do sploggers do it? How do you know if you’ve been splogged? And what can you do to stop it? Here are a few tips…
http://howto.wired.com/wiki/Fight_Splogs