If you're into science, or know a kid who is...

[A&A]

look how cool this book is:

http://www.powells.com/biblio/hardco...The%20Elements

This one's definitely going under the tree this year!

[Manonash]

check this out http://www.periodictable.com/index.html
Theodore Gray's website
After you posted this book, I looked him up and found this. I've been clicking around this site for a couple of hours. Really cool.
I've especially liked the mercury, arsenic, and uranium pages

[meemee]

oooooooooooh THANKS. got that for my dd.

AND this which she has been playing with for a while now.

http://www.physlink.com/estore/cart/...ayingCards.cfm