In the News Independent is a list of seventy-seven things you need to know about 07.
"2007 ends with a number seen as special around the world. To Christians it represents perfection, while Muslims speak of seven heavens. To others it is lucky, magical or powerful (as well as being the spot count on a ladybird). So will the coming year be special too? To help you decide, and prepare, Simon Usborne reveals the secrets of the mystical number seven."
A few items:
At a ceremony in Lisbon on 07/07/07, presumably at 7:07, the results of a global vote for the New Seven Wonders of the World will be announced. The 21 finalists include Stonehenge, the Kremlin and Timbuktu.
Seven is the optimum number of hours of sleep for humans, according to a US scientific study.
Seven is seen as a lucky number in many cultures. Japanese mythology talks of Shichi~~~ujin (The Seven Gods of Fortune).
The seven deadly sins, or cardinal sins, were refined by Pope Gregory I in the 6th century. They are pride, avarice, lust, envy, gluttony, wrath, and sloth.
The seven virtues are humility, liberality, chastity, kindness, abstinence, patience, and diligence.
Seven is "neutral" on the pH scale. Pure water has a pH of seven.
The average person's digit span (the number of digits they can recall in sequence) is seven.