Saint Valentine's Day (commonly shortened to Valentine's Day)[1][2][3] is an annual commemoration held on February 14 celebrating love and affection between intimate companions.[1][3] The day is named after one or more early Christian martyrs named Valentine and was established by Pope Gelasius I in 500 AD. It was deleted from the Roman calendar of saints in 1969 by Pope Paul VI, but its religious observance is still permitted. It is traditionally a day on which lovers express their love for each other by presenting flowers, offering confectionery, and sending greeting cards (known as "valentines"). The day first became associated with romantic love in the circle of Geoffrey Chaucer in the High Middle Ages, when the tradition of courtly love flourished. - wikipedia
Back in 2004 we made a fun flash game, thought you might enjoy a little blast from the past!
Other fun site for Valentine's Day:
History of the day
Valentine statistics
TLC How Valentine's Day works
Hallmark cards
Valentine concentration game
Online games
Have a sweet one however you celebrate :)