I just finished "Cruel And Unusual Punishment" by Nonie Darwish and I have to say it really opened my eyes to sharia law.
Mrs Darwish is a former Egyptian and muslim that immigrated to the US and converted to Christianity about 30 years ago, so she knows what the fuck she's talking about.
She explains the origins of sharia, then goes on to explain the concept, and finally lays out the disaster that it is today, both in the middle east and the US.
The book is very informative and easy to understand, easy enough for an Okie and possibly even a Marine (Fuck you, Woody) to understand.
I highly recommend this book for anybody that's concerned with the muslim takeover of the world.
It's available at Barnes & Noble and also at Amazon for under 15 bucks, so spare the price of an 18 pack and get some book larnin'.