I googled EMP+DAMAGE and these sites were on the first page. I just skimmed them, but some of the info on a couple of the sites seems to contradict the info on the other sites.... whatever:

http://www.aussurvivalist.com/nuclear/empprotection.htm

http://www.qsl.net/n9zia/emp.html

http://www.globalsecurity.org/org/news/2001/010930-attack04.htm

http://www.sonic.net/~doretk/Issues/00-03-SPR/theblack.html

Sue