Assuming I was close enough to be affected by the emergency, but not downwind of it:
1. Load up on iodine to help prevent thyroid cancer
2. Fill bathtubs/whatever containers I had handy with water (water system fails w/i 24 hours of lost power), shut off hot water heaters.
3. Go find some sort of weapon & ammo (shotgun best for mobs)
4. Top off food supplies
5. Barracade self & family in house.
Were I downwind, pack whatever I can carry into car, load up on iodine, and drive perpendicular to wind to get the F out of there. Then find shelter, etc.
Alas, Babylon is good reading for this sort of disaster preparedness =)
And if were outside the affected zone—yeah, do what I did on 9/11—bunker down at home and watch the news. (We watched ESPN, which was not as interrupted with idiotic local news as the actual affilates, it was just showing the ABC national feed)