Lost Symbol information on Twitter: @lostsymbol
Before The Lost Symbol was released I wrote an article pointing out the codes on the front cover and spine, and a few of the possible solutions. I've been meaning to update it for a while, but the easiest way is probably just to provide a PDF file of the Appendix 1 from The Guide to The Lost Symbol, in which I give all the codes (so far recognised) and their solutions. So, here it is!
Remember you can buy the complete guide from Amazon US for just $9.95, or if you're on the other side of the pond, from Amazon UK for £7.99 (mad prices, I know). If you're really cheap, or on the cutting-edge of technology (or both), you can instead grab the Kindle version for just $5.99! Either way, I appreciate your interest!
Update 19th Dec, 2009: I've just posted a HTML version of the article as well.