if you look at freerepublic.com and dailykos.com as competing products... then making fake posts to the competing products website in an attempt to drive traffic/users/clients to your site would be astroturfing
here is a slashdot story from today where the courts in NY ruled against the astroturfer
[slashdot] Internet Astroturfer Fined $300,000
does that help inspire any recourse?
Check out the link re: fine for astroturfing at this post.(166)