Am I the only one who isn't really impressed? The Wii was going for as much as $700, while the PS2 (back when it was still only available in Japan) sometimes went up to a $1000.
Also, the fact that it is just the peripheral selling well on eBay and the fact that it's still in stock at retailers is a very bad sign for Microsoft. It means that it is primarily existing Xbox 360 owners who are buying it, not the expanded audience i.e. people who did not care about the console. Since the whole point of the Kinect was to draw an entirely new audience to the console, that bodes rather ill for Microsoft's plans.