My car got broken into today. What should I do??

This Morning I noticed when I got into my Car that my Garmin GPS was missing. I looked around in the car to make sure it was not there. I also relized that my Sprint PDA phone that was disconnected but I kept around becuase it has WIFI was also missing. The Phone was in the Center Console but the GPS was exposed on the dash. The car was not broken into and im sure I locked it since I have keyless entry on my 2000 Grand Cherokee. (I should have known better) I live in a fairly new townhouse subdivision in Maryland and my car was parked right at my window. What should I do? Should I tell the police? Right now I feel like even if I do tell the police the chances are low that they can do anything? Any advice would be appreicated.