That's a shame, I was looking forward to meeting you... When I had a real job I did some research on data fusion in a vision (robotics) context using Kalman Filtering as the root technique - and I can't help feeling that it could be useful in a rating context; a possible way to fuse model-based and empirical techniques. We had great success with it in vision; the only problem is that I just looked through some old stuff and it looked like gobbledegook...!