Elf on the Shelf

Here is a fun new tradition you can start with your family. Elf on the Shelf is a little elf doll that reports directly to Santa Claus. Kids can tell the elf their Christmas wishes. They may also want to be on their very best behavior as the Elf on the Shelf has Santa's ear. Some children also like to name their elf. Place the little elf around your home during the weeks before Christmas. During the holidays the elf watches children carefully during the day. At night when the kids are sleeping the elf magically returns to the North Pole to report to Santa Claus. In the morning the elf appears in a new place which offers a daily hide-and-seek ritual for kids. Kids will love trying to locate the elf's new location each morning.

http://www.elfontheshelf.com/#/home

P.S. They sell these at Barnes and Noble
I think it's the cutest thing ever since I have an elf addiction!