The best source on the lost symbol of the Solomon key artefact is without a doubt the guy who deciphered the talisman copy (in the British library) who wrote the book - The hidden Records - Wayne Herschel
He has made the information freely available for those who cant afford books... http:www.thekeyofsolomon.net
He is active at the Dan Brown Facebook page discussing the new material.
Dan Brown seems to have chosen this artefact since it is the only historical puzzle not recognised as solved in academic circles. Is meaning is absolutely mind blowing.
I completely agree having purchased and half way read through. Its a terriffic book and very sensible indeed woven throughout with compelling and convincing common sense. Highly recommended. I for one believe and am sharing this one around to wake people up around us