I never read the 'Da Vinci Code' but pretty much know what it's all about as I've researched most of the "conspiracy theories" relating to the Dan Brown novels, the Vatican and Knights Templar. It was way overhyped in my opinion, and most of it is based on speculation and fiction. There is SOMETHING MORE to it all, but in many ways Brown serves as a smokescreen for the actual "conspiracy", and became a multi-millionaire in the process. It's like Harry Potter. On one hand the Vatican "condemns" these books, while on the other hand, it's bringing more attention and publicity to the Catholic Church.
Considering PI, yes it's another one of those key numerical factors, as it's the circumference of a Perfect Circle, which many researchers associate with the base value of the Great Pyramids of Giza in Egypt. Also the "23 Enigma" as popularized by Robert Anton Wilson in the 70's with his "Illuminatus" books, which might (or might not) also be related to the situated position of the Great Pyramids (based on the 23.5 degree tilt of planet Earth on its axis).
Of course there are 7's and 9's, and the ominous 666. Twelve and Thirteen are also numbers with very mystical connotations. 22, 33, etc, etc.
Some people, over the past few years, have stated they are seeing increased instances of 11:11 on their clocks, while many await the end of the Mayan Calendar in 2012, tied in with various other world prophecies which seem to announce the "Great Purification" a "Revelation" or just the plain old political "New World Order" which is ushering in a new age.
As for THIRD...? It's da bomb! Though, I do agree with someone else's comment in another thread that a little more bass couldn't have hurt the album overall, but it's still pretty awesome. All in all, THIRD seems a little more confined, a little more haunted and troubled and insecure of itself, but I definitely dig the sound and have been a Portishead fan since around '96. Great to have new material finally available, and seriously hope they'll get back in the studio again in the next couple of years for a follow-up.
Another album before 2012 should hopefully be doable. Since it seems this has been their most successful album so far, at least in terms of charts, maybe that will be more incentive to create more music?!?! .