I was able to check out one of those moving/vibrating seats a while back. It was hooked up and used the extra data track on the Spiderman disk to add effect. It's basically a couple of theatre seats that move and shake with the movie - your seat shakes, not something shaking your seat. For the life of me, I can't remember who made the thing.
The big showcase was the glider scene in Spiderman, and pardon my Peter Parker-ignorance, the bad guy was flying through the sky on a glider. As I recall, I found it interesting but a tad distracting. Kind of 'hokey' really. The seats were shaking and tilting and swaying back and forth and it felt a little silly. Maybe it just needed to be broken in.
"Chickens don't clap."