This web page have a free services (at least for the moment) that search the internet for the EXIF info and use the unique camera serial number to identify if you stolen camera is use to upload a photo to the internet. Its a great tool to have at hand in that horrible moments.  Stolen Camera Finder

Theres another services like this and its called GadgetTrak  here is the story of how a Photographer Recovered $9k Worth of Stolen Gear