Since being released last April, the $89 game which comes with the Wii Balance Board has skyrocketed up the sales charts, and has stayed there regularly since. "The appeal of Wii Fit is so broad and its ability to keep attracting new users every month has really played out time and time again," says Cammie Dunaway, Nintendo's executive vice president of sales and marketing. But we already knew that!

Wii Fit sales have beaten even the top Wii games such as Super Smash Bros. Brawl and Super Mario Galaxy. They've even beaten Madden games or Guitar Hero games. It's even bigger than Call of Duty: Modern Warfare and Halo 1, 2 or 3. The success if likely because the Wii Fit attracts both old and new gamers. Even for people who think of themselves as "non-gamers" can play, and do.

Making Wii Fit a blockbuster is the fact that approximately 7.9 million copies of the game have been sold in North America through August 2009, according to NPD. Mario Kart Wii is ranked at number five with 6.7 million units sold, so Nintendo is grabbing positions with its Wii offerings generally.

It's true though that Wii Fit sales, which were strong in January, began to drop off each month since. Will sales resume for the holidays? Well, the game still sells well, and it's likely that September sales will keep Wii Fit on the charts. Especially with the recent release of Wii Fit Plus on October 4.  In order to compete with cheap toys, Nintendo lowered the price of the console to $199, so Wii fit bundles are also a good deal now.

And guess what - the top seller since 2000? It's Wii Play with sales of over 11 millions units. Next is the Vitality Sensor - with release dates and details still to come. This sensor will monitor your heart rate and tailor your experience to your mood. Nintendo just keep innovating - with more for the Wii Fit and Wii console coming soon.