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 This useful resource has been archived here in order to keep it alive.
Gematria Calculator - Gematria is the practice of calculating the numeric equivalent of words and phrases by adding up the numbers associated with each letter. The gematria calculator makes it easy to calculate the numbers for English, Greek, and Hebrew.