I just did a search at Hotbot (http://www.hotbot.com/ ) using "EMP Electromagnetic Pulse" and got lots of sites for EMP.

I have heard that wraping items in foil helps, but I don't know if that is just a 'wives tale' or not.

This site tells how to protect ground facilities:
http://www.jya.com/emp.htm

and more from http://www.geocities.com/CapeCanaveral/5971/emp.html:
There are two basic ways to harden items against EMP effects.20 The first method is metallic shielding. The alternative is tailored hardening. Both methods will be briefly described.

Metallic shielding is used to, "Exclude energy propagated through fields in space."(21) Shields are made of a continuous piece of some metal such as steel or copper. A metal enclosure generally does not fully shield the interior because of the small holes that are likely to exist. Therefore, this type of shielding often contains additional elements to create the barrier. Commonly, only a fraction of a millimeter (22) of a metal is needed to supply adequate protection.
This shield must completely surround the item to be shielded. A tight box must be formed to create the shield. The cost of such shielding (in1986 dollars) is $1000 per square meter for a welded-steel shield after installation.(23)

The alternative method, tailored hardening, is a more cost-effective way of hardening. In this method, only the most vulnerable elements and circuits are redesigned to be more rugged. The more rugged elements will be able to withstand much higher currents. However, a committee of the National Academy of Sciences is skeptical of this method due to unpredictable failures in testing.(24) Also, the use of this method is not recommended by the National Research Council. They doubted whether the approximations made to evaluate susceptibilities of the components were accurate. They did concede that tailored hardening may be useful to make existing systems less vulnerable.(25)

There was lots more too.

Canie