Today is October 31st, 2008... Halloween.
Setting aside the discussion of whether or not it behoove God's people to participate, isn't this a real opportunity to evangelize? I'm not sure how many people are going to come to your door, willingly, everyday. But this one night, the most impressionable will come. 10, 20, 100 kids knocking on your door looking for candy.
Can't we use this time to give them so much more?
They are coming seeking. Feed them.

When they had finished eating,
Jesus said to Simon Peter,
"Simon son of John, do you truly
love me more than these?"
"Yes, Lord," he said, "you know that I love you."
Jesus said, "Feed my lambs." (John 21:15 NIV)