I've been kicking the idea around for a while now, and mentioned it to a few people but Blake Hall is the one who really took the initiative. He has set up a wiki to start the planning of a DrupalCamp in Wisconsin for 2007.
Visit the DrupalCamp Wisconsin wiki if you are interested in attending, or sponsoring, or participating in any way. We still aren't sure if it will be in Milwaukee, or Madison, or halfway in between. Join us and help figure those things out. (2XL Networks will most likely sponsor the event in some way.)