My thoughts and sympathies go out to the students and staff, faculty and families, of Virginia Tech.
All of us in education work hard against such despicable acts of violence every day that we come together peacefully to teach and to learn, to remember and to understand, to make life better not only for ourselves, but for all.
I might suggest that this is a good time to explore organizations working to curb gun violence in America, such as the Brady Campaign. I've also found the Berkeley Media Studies Group "Reporting on Violence" project, including their downloadable PDF report, "Reporting on Violence: A Handbook for Journalists," to be a useful classroom resource.
UW-Madison folks might check out this list of ways to show support for Virginia Tech here on campus.