Recall the NGA provides timely, relevant, and accurate geospatial intelligence and information in support of national security. The vision of "show the Earth.. know the way" is supported and promoted to youth via this very cool portal. Resources are currently categorized as SRTM, learning, and games.
SRTM - this section provides kids with everything they need to know about the Shuttle Radar Topography Mission which launched Feb 2000 with an ambitious effort of mapping the planet in 3D
Games - crossword puzzles, make-a-map, word search, and coloring can be found here. Image Ace (requires Flash) is loads of fun!
Learning - this section has a bit more meat and jumps into the who, what, where, when and why of maps and geography.
Given that there's nothing good on TV this time of year and the hockey strike is still on, try spending some time here with your kids and teach them about geospatial technologies.