Kotaku: Here's the list of games that get played the most per user on the Wii that we track once a month. Subtle changes this time. Very subtle.
The order of the games hasn't changed. There's no leapfrogging, though there is still that nasty traffic jam in the mid 40-hours section. (Click the chart to enlarge it if you can't see it that well.)
You may notice that the rate of increased playtime has slowed for most of the games, likely due both to the messiness of having had to skip an October date - because the Wii stats weren't being counted properly by Nintendo then - and due, as I noticed a year ago, to the fact that playing-time growth slowing around this time of year.