Amazon and Poetic Justice
Amazon has been sued by Cendant for violation of its patent for "System and Method for Providing Recommendation of Goods or Services Based on Recorded Purchasing History". Cendant claims Amazon's "recommendations" feature infringes its patent because it tells customers who are interested in an item what other products were purchased by customers who bought the same item. Ridiculous.
Poor Amazon—yeah, the same one that sued Barnes and Noble for infringement of its ridiculous one-click patent. I really weep for them.