Another fan of Mytopo.com here. I have used several of their maps and have been very happy with them. I also use DeLorme Topo. I have some real issues with this software but it seems to be the best product available at this time. I also carry the Delorme state atlas in my truck.
I live along the South Carolina coast I have a bug out kit for the family and another for myself (I have to stay during storms). Included in both kits is a family emergency book that includes maps. Mine has detailed waterproof maps to aid me in getting home after the storm.
I grew up in the Sierra Nevada mountians and learned quickly that you always take a map, compass, GPS and the knowlage to use them when you go into the woods. Take a little common sense with you as well, it just might save your life.