Christian Numerology, Symbolic Meaning of Numbers in The Bible
Verichip and 666 - Epi, Charagma, and Chi-Xi-Stigma - How the Verichip implant and syringe are related to 666 including the Greek Epi, Charagma, and Chi-Xi-Stigma.
The Infamous 666 - Discusses the signifigance of the most unholy of numbers. A general overview with many interesting links.
Numbers: Symbolism and Properties - This was once just a link below but the site has since disappeared. This useful resource has been archived here in order to keep it alive.