The people operating the wireless can get a list of MAC addresses connected to the access points.
1) AS SOON AS YOU CAN, call the networking people at your campus. They should have sufficient records to get your MAC address for wired or wireless just from your name (depending on which you registered with them); then if that machine is ever used on campus again*, they can track it to a wireless cell or (depending on how your network is set up) to within a building.
2) Do you by any chance have any software that causes your machine to check your school email automatically? If you do, contact your school email administrators (NOT BY EMAIL) and ask them when the last time your account was accessed and from what IP address; you might just get lucky.
3) This is a desperation thing, but if you have your MAC address (or can get it from school networking) and had your computer configured to autoconnect to wireless access points (your own, or another that you know the SSID of), you can go reverse-wardriving. You'll need a borrowed laptop, unfortunately. Get your router, or another router configured with that SSID, and power the router off of a power inverter in your car. Then drive around and see if your computer autoconnects. This is a needle-in-haystack problem, unfortunately.
Fortunately the statistics are a little bit more in your favor: since it was ganked from your dorm room, it's probably another student ... and probably one that doesn't know much about networking. If they ever use that machine on campus again*, your network people should know.
*If they're smart, they can do some Linux ifconfig ninja-stuff and change the MAC address. Most people who do that, however, probably already have a laptop and don't go around ganking Inspirons.
I had a laptop stolen two years ago ... it sucks badly. Good luck finding it... and then stringing up the thief with cat-5 and flagellating him.