Most amusing on the site are the warning illustrations that hearken back to the old "duck and cover" method taught to school children during the cold war.
Here's how the website explains its mission:
Terrorists are working to obtain biological, chemical, nuclear and radiological weapons, and the threat of an attack is very real. Here at the Department of Homeland Security, throughout the federal government, and at organizations across America we are working hard to strengthen our Nation's security. Whenever possible, we want to stop terrorist attacks before they happen. All Americans should begin a process of learning about potential threats so we are better prepared to react during an attack. While there is no way to predict what will happen, or what your personal circumstances will be, there are simple things you can do now to prepare yourself and your loved ones.
The website covers everything: biological threats, chemical threats, nuclear blasts, radiation threats, natural disasters.
One of the main problems with the site is that it is too vague and offers no explanation. Terrorists are plotting, make sure you lock yourself in your house with plenty of bottled water and canned goods.