If you live anywhere near any kind of river, stream, pond etc. make sure your photographs are not stored in your basement.
I live in one of the towns that has been impacted by flooding over the past few days and a neighbor's friend found all her family photographs floating above the furniture in two bedrooms in her basement. I'm told it was quite a sight to behold :) She is currently trying to dry them all out.
So how do you save photographs that have been caught in a flood? http://www.ehow.com/how_2052698_save-flood-damaged-photos.html
If you have negatives and they are safe just make more copies.