That is pretty sweet. A couple of Eindhoven design students working under the name Ontwerpduo created this table where a marble run runs through the base and legs. It's part of a hotel for kids concept that also includes a cutesy pillow/stitching game thing.
Which is nice, but I think the kids'd be happier with room service bringing them Ben & Jerrys' while they jump on the beds.
Ontwerpduo Fun Studio [ponoko.com via dt reader julie]
I spent hours with my kids putting together a plastic marble run that SUCKS!! The marble run has gears, but the marbles don't actually spin the gears, they're there for decoration - WTF..
Anyway this table is awesome! Biggest problem would be that everyone would be camped out under the table watching the marbles zoom past during dinner.