This is by no means the most scientific of measurements, but GTA IV for both Xbox 360 and PS3 is currently being outsold on Amazon by Wii Fit, Mario Kart Wii and the Wii Wheel. Things to keep in mind: the Nintendo games are each single platform (effectively doubling their sales) and Wii Fit pre-orders may be more common than GTA IV pre-orders this close to GTA IV's launch (at this point, gamers may be more likely to just go to the store to get their Liberty City fix). Still, we didn't expect Wii Fit's pre-sale numbers to come out on top today on Amazon. At all.