Thanks to the internet and contessagrrl's excellent google-fu, we learned that it's a <http://en.wikipedia.org/wiki/hang_(musical_instrument)>hang [drum]</a>, invented about 10 years ago by a couple of Swiss guys. It sounds kind of like a cross between a steel drum and a xylophone. Or like a steel drum that's been rubbed in aural butter. It's awesome, and I want one. Unfortunately, they're expensive and kind of hard to get your hands on.
This YouTube video shows that you have to be a hippie boy to really get the hang of it, though.