This was kind of last year's Kindle effect. Pete mentioned being addicted to Animal Crossing, so being the good little do-bees we are, many of us also became addicted.
You start off with a town, you name it, and you name your character. There are other "townies" already in the town. You work to get your house, then enlarge your house. You earn bells (which are the monetary units in your town). You fish, catch bugs (during their appropriate seasons). You donate things to the town museum, and sell extras for more bells. Generally, you just try to improve your town. When you get bored (we've never done this), you can burn your town town, and start all over. There's no "winner" and the game never ends. Just goes on in real time (although you can cheat and change the time if necessary). If you have friends who also play, you can visit their towns (and they can visit yours). If you have WiiSpeak, you can actually talk to them! People get a little freaked at the idea of people (strangers) visiting, but only the people you give your friend code to can visit. You can send mail to your towns people, or your other friends.
There's a thread on the community boards about it, as well as one here under the Podcasts.
We like it.
Now, how did you figure out how to get around in Mario Bros??? I just can't figure that out
I need Mario lessons...
She has been improving though. 
