Secrets behind 'The Da Vinci Code' - Dateline Specials - MSNBC.com
These days, in bookshops, you find more copies of books elaborating on the Da Vinci Code than the book itself. The above article is worth a read only for the hype [read: controversy] that the work of fiction caused - shaking everything right up to the church (lest people seriously start believing the written word).
As discussed in the rather long article here, I also dont particularly agree with the interpretation of the famed "Last Supper". The M [or V for that matter] could be totally unintentional, or maybe to add a sense of symmetry to the painting. Maybe it stands for "Mo". hehe.