Exactly what a "patent troll" is is hard to determine, as is the harm such trolls do. But Drew Curtis of Fark presents an interesting case against one possible troll.
See also Mark Cuban's rant:
This is a problem that obviously makes me incredibly mad. When it comes to this issue, Congress is a bunch of gutless , ignorant pansies on their knees to the IP terrorists of the business world. They won’t realize what is at risk until the number of companies in their districts going out of business after being sued for ridiculous patent infringement skyrockets.