A few days ago, a Texas-based company called InNova Patent Licensing filed an infringement lawsuit against 36 well-known companies. The company claims to hold the patent on spam filtering, and appears to be resting on the notion that any company using spam filtering owes them. Among the companies being sued are Google, Apple, AOL, Dell, HP, RIM, Yahoo, McAfee, Symantec, and Siemens. The list doesn't stop at tech companies though. It also contains names like Frito Lay,