I know there are a few others who have this or are thinking about it - I'm becoming obsessed with mine! lol!
I've had it for 4 weeks and my time counter just turned bronze, because I've accumulated a total of 10 hours of activity time. (will be another hour or so today on top of that!)
And I just figured out how to combine Walk Away The Pounds with the Wii Fit. They do let you add other activity in, but that's not as much fun. And there is a free step program where you can set it for 10, 20 or 30 minutes and the Wiimote clicks for you to pace while you do steps on and off the balance board while watching a regular tv show. I try to do that a few nights a week. But that wouldn't work with WATP because you move around a lot, so you can't just stay in one place and step on and off the balance board.
I realized today that there is also a Free Run program where you hold the Wiimote and that tracks your movement. So I set that up and had it track while I did the 2 mile WATP. It gave me credit for more than two miles, but that may be because there is so much other movement - walking back and forth and sidesteps, plus lots of arms, leg lifts and kickbacks, etc.
This is such a great way to combine my new obsession with something I wanted to do anyway. and aside from the 30 minutes of the WATP/free run, I'll probably end up with another hour or more of the rest of the stuff I like to do like the obstacle course and boxing and some of the balance games.
If anyone is thinking about getting a Wii, I really can't recommend it enough, I LOVE mine!

Yep....I am sorta obsessed. Well, 'obsessed' might be a bit too strong, but I do love the Wii Fit Plus! I look so forward each day to going home and getting on it. I am having so much fun, and getting some exercise, too! I mostly enjoy the games that really get your heart pounding and muscles working (hula hoops, bicycling, flying, jogging, advanced step, etc.) Even some of the balance games can give your muscles a bit of a burn if you do them just right. For example, the slalom snowboarding makes my thighs burn if I keep my knees bent the whole time and do it several times in a row. Wii Fit Plus rocks!! 

He hooked it up for me, but like a previous poster said, it hooks up just like your DVD player. TVs have gotten more complicated, though, and we have all of these 'input' options on the TV. My son hooked it up so that I go down to "Video 2" for the Wii (Video 1 is our DVD player). So, that's my advice--borrow a teenage boy!!! 