I don't get it. (search results)

I searched Technorati for a few search phrases and notice that on the first page of results alone, six "different" blog posts were exactly the same.
http://florida-jackson.livejournal.com/65360.html
http://barney.our-blogs.com/?p=547
http://mycause2.our-blogs.com/?p=413
http://wisewords.startblogging.info/?p=847
http://marylyn.joleentan.com/?p=695
http://esteen.blogspot.com/2006/08/web-site-traffic-search-engine.html
WTF? I assume this is a common occurance to use blogs to generate ad revenue by repeating the same content over and over again. But unlike blogs which are a mass of computer generated keywords, these appear to have originated from a real person making a legitimate blog post. I mean this post isn't exacly chock full of high-profit keywords so it's shouldn't be all that efficient at being found in common searches. Just wondering.