Who knew three little chipmunks could show so much strength? Alvin and company stayed near the top of the box office list this week with a #3 showing, losing only to the mighty Nic Cage (we never thought we'd call Nic "mighty," but there you go) and Will Smith (we've been calling him "mighty" for years). Cage's National Treasure: Book of Secrets had the third biggest Christmas opening weekend ever, after Lord of the Rings:......