A History of All-hallows Eve
18.33.42 - Mark
One of the best things about Halloween, other than free candy and geeks building haunted houses, is that it is one of the few holidays that has been completly secularized - so much so that its easy to find religious individuals (from a variety of faiths) that absolutly hate it and are calling for its destruction. Of course, part of their hatred of the holiday is that they are ignorant of its history, from Celtic traditions thousands of years ago to the Christian tradition of begging for "soul-cakes" which led to the modern trick or treating to the modern myths about apples with razor blades and poisoned candy.
For a more fleshed out Halloween History, check out this article on OmniNerd