Sign up for Homeland Security's "cyberterrorism" alerts
According to this AP story on the WSJ site (subscription required):
Americans can sign up beginning Wednesday to receive free cyber alerts and computer advice from the Homeland Security Department to help protect themselves on the Internet.
The new National Cyber Alert System, expected to be announced Wednesday, is an ambitious program to develop a trusted warning system by the government to help home users and technology experts. It will send e-mails about major virus outbreaks and other Internet attacks as they occur, along with detailed instructions to help computer users protect themselves.