I'm a person who oppose all kind of software patents. any use of software patents is a patent troll (if you have patent, you should have a clear patent policy that it's for defensive purpose).
According to the case of Bilski, patents should involve a machine, otherwise it's invalid. But trolls don't care of their patents are invalid, because of how patent cases are handled in courts
http://www.groklaw.net/articlebasic.php?story=20081102011538...