Ok...
A. Wiiware FTW
B. For add-ons: Either temporarily put on wii memory, like nintendo does with programs on SD cards,
or store it on an SD card. Depends on whether or not an SD card is in the wii.
C. Same price as PC version, gives you a code to enter on PC so you can play PC version, Connects to PC version servers... in other words:
Complete compatibility with PC version!!!
And again: Torque has a Wii version almost exactly the same as the PC version.