My kids have been knows to sleep through the shrill sound of the smoke detector, so when I saw this at Babygadget I was fascinated. The KidSmart Vocal Smoke Alarm allows you to record a personalized alarm sound: a message and instructions, in your own voice. Apparently children are more likely to wake up to this sort of alarm than a generic beep, not to mention feel comforted by the sound of your voice during a scary situation.
Which reminds me, if your children sleep in second-story bedrooms, consider purchasing a fire escape ladder and keeping it upstairs so they can climb out the window in the event of a house fire. We keep this Kidde collapsible ladder in the back of our son's closet.