I got the chance to work with some talented partners on a recent voting visualization which tracked voting check-ins on foursquare on a voting map. (its also embedded below)

When we first conceived this idea, it was setup to accomplish three major things

1. Encourage civic participation through the distribution of the I Voted foursquare badge for all foursquare users who “shout” that they voted (variations count: vote, voting, voted) while at a designated polling location
2. Increase transparency at polling locations by visualizing the time of day, checkin volume and gender of those checking in
3. Develop a replicatable & scalable system to use for the 2012 Presidential Election based on learnings from the data that is produced for the 2010 Midterm Elections

I think we accomplished all these things, and more.  We also created a foursquare I Voted badge for 2010 which was a huge success