The shooting at Virginia Tech is a terrible thing. My heart goes out to all the victims who were just there to learn something to make their lives better. My heart also goes out to the shooter, he should not have done it, of course, but college can be very hard and demanding, far from home and without a support system until you make one yourself. Which can be very hard when you are going to school, doing homework and working.
What to do in such a circumstance? First don't panic, find cover, determine what is happening, and evacuate the area in a rational manner. The police are going to take a very long time to show up, so don't expect to be able to sit there and be rescued, you need to rescue yourself.