I just stumbled upon this site and though the people here might like to have a look. Its for table saw cutting jig that looks very well thought out.
http://www.island.net/~macduff2/
videos of it in action are here:
http://www.motiono.com/profile_videos.m?ceo=macduff
Is the saw top cast iron or aluminium? If it's cast you could try one of those powered magnetic hold down things to stop the far end of the fence form moving.