Visualizing DC Home Price Ranges in D3.js (trends.truliablog.com)

Check out the new data visualization from Trulia on home price ranges in Washington DC

I would place the black box somewhere else and make it non-movable, because right now it obscures everything under it and moves too quickly I think. But it is a good job, could be helpful for me a year ago when I was looking for a place in DC )