National Geographic KidsSpring 2012 Website
The National Geographic Kids site is chock full of captivating videos and content. The "Animal and Pets" section and "Countries" section in particular have hundreds of videos that my kids loved watching. The written content is also thorough and educational, but many kids will favor the videos. In the country section, each video is about one specific topic, so you won't necessarily get an overview of the whole country. For Nigeria the website featured a dance festival of a particular tribe, for China it was about how the desert is encroaching on the farmland around Beijing. The photos are amazing also, and since it was close to Martin Luther King Jr. Day, we looked through a well-annotated set of photos of Dr. Martin Luther King, prompting a discussion about his "I Have a Dream" speech.
My kids always go straight to the "Games" section on any new site. The National Geographic site has dozens of games. The featured game, "Zipper's Cave Maze" is quite difficult, but let's you restart where you ended, so it was fun for them to play. You may not see all of the available games on the "All" tab, but the more detailed game-type tabs (Adventure, etc.) will showcase more. Additional site features include a section for kids to upload videos with parent permission, and another one including videos with Mandarin Chinese narration.