“The Wave” is a bit like a skateboard, but it only has two wheels and is meant to feel more like surfing or snowboarding. There’s a brief review on about.com and a bunch of action videos on the manufacturer homepage.
It’s a stupid name, obviously coined so that they could use the phrase “Learn to ride The Wave” (groan). It was previously called the “X-board”. Regardless, I think that I want one.
I recall seeing them for sale locally for around $100 (although I could be wrong about the price).
Update: I found an image on the Amazon product page
Update: It’s called the vigorboard here and they sell for $199 (although it’s billed as $50 off the RRP of $249). They are apparantly conducting market testing in Bunbury.