Actually, the Wii has more games with 3+ million sales than the 360 (5 vs. 2).
It also has more 1+ million sellers in one year than the 360 had in its first year.
So, yeah, there are plenty of fun games out for the Wii and even more in the pipeline. By next Christmas, the Wii will have blown the competition out of the water in software sales.
My End of 2008 Hardware Predictions (console only):
Wii : 50 million
360: 28 million
PS3: 24 million
These predictions were made on January 3rd and won't be revised