http://www.msnbc.msn.com/id/10017786/site/newsweek/
Splogs, a contraction of spam blogs, are a crafty form of advertising or self-promotion: a blog that carries no useful content but serves merely to feed search engines. Citing the Newsweek article:
QUOTE
Here's how they work: first find a subject that draws consumers who may be valuable to advertisers on Google or Yahoo, and register for the programs that let those search companies place ads on your blog. Then set up a blog that automatically sucks in items from the news (via easy-to-set-up feeds) about that subject. If you've done it right, Google's search engines will identify your blog as a prime place for a high-value ad. Then, as Sifry says, "you can pay housewives in India to sit there and click on the ads." Because programs like Google's AdSense pay out each time someone responds to the ad, it's possible to make a bundle from this.
