#5 A Kid's Heart Christmas Games This site has a whole list of cute and simple games to play. Some of them are better than others, but they kind of entertaining.
#4 Starfall Gingerbread Man Starfall is an incredible educational website that is available all year long. It has great games and online activities that encourage reading skills. One of my daughters favorites is the Gingerbread Man that allows kids to decorate it anyway they want. What I love about this site is that the kids can click on each word in the directions to have them read aloud.
#3 Elf Yourself If you didn't see this last year, you will get a giggle and so will your family. Simply place pictures of your family members on the elves and watch them do a jig. Oh and while we adults were trying to be cool and not laugh too hard, the kids were cracking up!
Norad Tracks Santa. This is a close second for my favorite holiday site. They have lots of fun games for the kids to play, even I got stuck playing a tetrus like game the other night. The best thing is that starting Christmas Eve, they "track" Santa's flight around the world with cute little cartoon type videos, so your child can see where Santa is before they go to bed. It's lots of fun and the kids get a kick out of it. It has become tradition in our family to see Santa over London where Nana and Papa are before we go to bed.
Then Santa sends you a personalized video message for your child Santa checks his file and shows pictures of your child and everything. Last year my daughter went nuts when Santa showed a photo of her and her cousin on vacation and mentioned how lucky she was to have gone on vacation this year. She started yelling "Santa! That is my cousin Santa!" It was so wonderful! Literally brought tears to my eyes!