This is a link to a thread on this same topic....
http://projectavalon.net/forum/showthread.php?t=12960
Whether one believes Ed Dames or not, the thing to keep in mind is that it has happened before (1800's) when we were not reliant on the power grid. I am not concerned so much about the effects of the solar flare on us, as I am the consequences of what people will do to each other when they have no power/water/ food at the stores.