Personally, I was a huge fan of the Wii/Revolution when it was first announced (and Nintendo in general). I thought it would be the greatest thing to ever happen to gaming. Then I actually used it to play Metroid Prime 3 and Super Mario Galaxy. Meh, I'll take a gamepad any day. Wii Sports is fun though.
Now we have Natal and the Sony wand. I don't hide my skepticism of Natal. I'm not sure what it will do for gaming, until we have some concrete examples. The technology is cool, the applications to gaming are what I'm unsure of.
As for Sony's wand, there's only one thing I want from it. Lightgun games. If they can give me some good lightgun games, I'll buy into their motion controls.