For me, it's Farm Town rather than Farmville (pretty much the same game, but with fewer bells and whistles). I studiously ignored these sorts of games for six months or so, but then my sisters dragged me in. Fortunately, shortly after I realized that I really cared far too much when I wasn't able to harvest my cabbages on time, my daughter discovered the game and now SHE takes care of the farm. It's a perfect game for a ten year old--a little bit of strategic planning, a little bit of learning about simple business, some responsibility (and the attendent slight guilt when you don't get those cabbages on time), and a bunch of cute animals.

And since getting addicted and then weaning myself, I have assiduously avoided all other requests to start playing Mafia Wars, YoVille, Castle Age, Bejeweled Blitz, Cafe World (or whatever the name is), etc.

Sarah