+1 for linux drivers too, also for human/robot interaction work. We are a group of labs that are evaluating the EyeX right now to see if it can be integrated on our project. While we do have expensive gaze trackers (with glasses), the EyeX could open new possibilities for us. However, windows only driver is a major obstacle right now.
Also, for people interested in human/robot interaction with EyeX, have a look at http://developer.tobii.com/community/forums/topic/eyex-gazesdk-and-monitor-less-calibration/#post-1600