stolen 2007 Cannondale BadBoy

My bicycle was just stolen (Aug 16, 2009) from the Barnes and Noble at 1414 W. Webster Ave in Chicago at about 8pm. It was locked to a bike rack directly in front of the store with a cable lock. (Usually I use two locks but I forgot my U-Lock.) It is a black Cannondale Bad Boy size Medium with front and rear lights. It also has a place on the frame just under the seat to attach a U-Lock. I purchased it for $750 in July of 2007. Does anyone have any suggestions as to how I can get my bike back?