It appears that Sony’s game controller woes just continue to grow. Fenner Investments Ltd. has sued Microsoft (Xbox 360), Sony (PS2), and Nintendo (Gamecube) for allegedly infringing U.S. Patent No. 6,297,751, which describes a low voltage joystick port interface. The case is Fenner Investments Ltd. v. Microsoft Corp. et al., case no. 06-cv-08, in the U.S. District Court of the Eastern District of Texas. We’re adding the case to our tracking list, and we’ll keep you updated as we learn more.