Got a Wii about a month ago, and we have a blast with it. The kids love it, the wife loves it, and I love it.
We have the obligatory WiiSports/WiiPlay, as well as Smooth Move and Madden 08. We also have an XBOX360 and PSP for those long plane trips. The XBOX is great in its own right, and really compliments rather than competes with the Wii.
I hope to get some good information here, as well as (hopefully) provide some help to others.