Printouts of emergency info such as how to make water safe, food safety during power loss, where to find water in your house, how to sanitize dishes after use, emergency hygiene, etc...

Dollar-store flashlights and radios.

The ability to charge their cellphones, iPods, etc at your place using solar panels.

Back when hurricane Ike took out our neighborhood power for a week we made sure every household had a walkie-talkie. Luckily there are a lot of hunters in our neighborhood and they all had the radios, plus they show up cheap at the local sporting goods store. Anyway, every house had a way to call for emergency help which gave everyone a great deal of comfort. Make sure they keep them on the same station.

-Blast