When we heard that Nintendo and the American Heart Association would be making an announcement today, we (and most everyone else) assumed that it would have something to do with Nintendo's forthcoming Vitality Sensor. As it turns out, however, it's something altogether more surprising -- the AHA has announced that it's actually putting its stamp of approval on the Wii itself (as well as Wii Fit Plus and Wii Sports Resort). That's obviously a first for a video game console, and fairly unprecedented for the AHA -- as ABC News points out, the association hasn't