The Dark Knight: 'Where Does He Get Those Wonderful Toys?'

This Wired.com article talks about several of the tools used by Batman in The Dark Knight and their real life counterparts. Here is the component that deals directly with information technology:

3-D Sonar System

Since the Joker does not have a lair or a base, Batman must track the constantly mobile madman through the streets of Gotham. To do this he uses a cowl-mounted sonar device that triangulates the baddies' cellphone signals and then renders the sound of their communication into a 3-D visual map.

Real-World Counterparts: Lidar and Sonar
Usually utilizing lasers, a Lidar system measures reflected light to find the range, dimensions and other properties of far-off objects. Sonar, of course, is the technology of bouncing sound waves off faraway objects to get a realistic picture of where those objects are. Combine the two, and you've got the 3-D system Batman uses to hunt his quarry.

URL = http://www.wired.com/gadgets/miscellaneous/news/2008/07/bat_gadgets