One subject that few of us regular folk have mastered: EMP protection. I could have spent a while condensing the information on the web site of this link but that would have been a waste of time. The author has exhaustively covered the subject. I'll let him speak for himself.
http://www.futurescience.com/emp/emp-protection.html
His article is full of links to outside sources of info about hardware involved and other items of interest to preppers. One link leads to a list of EMP myths. Very interesting stuff you won't find elsewhere.
He really covers the two most likely sources of EMP 'attacks'- a solar flare and an intentional nuclear detonation. Personally, I find the solar flare a bigger threat. A flare can easily cover the entire globe and leave us all in the dark. The only 'good' part is that we will have 2-4 days' warning of the arrival. That can make a critical difference, as we scramble to shield our delicate electronics. And if we're lucky, some shelter for ourselves.