Confederate Yankee has done an excellent post on disaster guns, discussing the features and characteristics of the weapons you will need to have at hand if things get ugly.
Here's an excerpt from the beginning of his post:
"It will come in the form of another hurricane, or an earthquake, an outbreak of disease, or another eventuality of which we have not dared dream, even in our darkest thoughts. When that time comes, the only thing that may preserve your life and property may be the possession of and willingness to use a firearm.
Not all firearms are suitable for civilian defense. Most, in fact, are entirely unsuitable for the kind of situation brought about in natural disasters such as Hurricane Katrina."
You should go read the entire post, check your gun safe, and maybe plan a trip down to the gun shop, then the range.
Just owning them isn't enough.........
Hat tip in order to Cowboy Blob for finding the story.