For Christmas we gave ourselves the Wii Fit Plus. It totally rocks. And it is well worth the investment.
We're almost 4 weeks into our Wii Fit adventure and I'm definitely an advocate for this device. We'd play Wii Sports before but it's nothing compared to this. It's like playing a video game that requires you to engage physically. And it tracks your exercise history, graphing it all out. Breaking out aerobic vs. Yoga vs. strength training, etc. I've also taken walking up a notch. At least once a week I've gone on a power-walk (2-3 miles at 3-4 mph).
Next step is more focus on diet. But I'm already reaping the benefits of the additional exercise so I consider this last bit "tuning." And self-control.