Magnetic Pole Reversal

Dear Cecil,
What would happen to our technology, electronics, satellites, etc. when the magnetic poles shift again? Some geologist believe the earth is overdue for a pole reversal.

My question stems from a NOVA documentary that I just watched.
http://www.youtube.com/watch?v=NJUTUFAWfEY

Someone else might be along to provide their own answer, but here’s Cecil’s take on the subject.