The only one I know of right now is the Excalibur Phantom Force, which you can easily google.
I gotta say, though, that the level of whirring and grinding involved with the mechanical assembly, I'd be sticking with my Novag Obsidian in a heartbeat.
Here's a YouTube video of part of a game:
http://www.youtube.com/watch?v=QJADuhQAUQ0
The optional sound effects are ON in the video, but the (mandatory) sounds of the auto-move 'feature' are what bother me.
I'm interested in getting an electronic chess set where I can play the computer and the pieces move with magnets. If anyone could recommend a good brand I would appreciate it. By the way I'd like to get a set whose playing strength goes up to about 1800 at the most.