Dotnaught sends us to InformationWeek for news of the latest lawsuit by Polaris IP, which holds a patent on the idea of responding automatically to emails. The company has no products. It brought suit in the Eastern District in Texas, as many patent trolls do — though the article informs us that that venue has been getting less friendly of late to IP interests, and has actually invalidated some patents. The six companies being sued are AOL, Amazon, Borders, Google, IAC, and Yahoo. All previous suits based on this patent have been settled.