If you want to put a huge smile on your child's face - look no further than www.portablenorthpole.com
I came across this wonderful website a couple of years ago, and have used it every Christmas. Your child willl get a personal email video from the big man himself! It gives you a few options when you log in, but I always go for the free of charge video message. It will take you a few minutes to set up and the resulting message is well worth it. Be prepared to well up a bit when you watch it - it's a truly magical experience.