ThinkQuest.org (http://thinkquest.org/index.html)

This site is an all-around winner. Participants get the chance to exercise creativity, conduct research on a topic that interests them, learn new skills, and express themselves both verbally and visually. Plus, there's the invaluable experience of working collaboratively with a team. For visitors, it's interesting to see how the projects have gotten more sophisticated over the past 10+ years -- sort of an Internet time machine. And, with topics ranging from martial arts to Freud, the library has something for every surfer.