[rmidthun]

It depends on what you mean by layman. I found the book Quantum Computing Since Democritus by Scott Aaronson to be very easy to understand, but it does require some linear algebra and complex numbers. I don't think you can get a good overview of entanglement (where the madness lies) without that basic level.

Check http://www.scottaaronson.com/democritus/ and see if it works for you.

Otherwise, you are in the realm of popularizers like John Gribbin, who I found entertaining but not very enlightening.