Water Life - Produced by the national film board of Canada it is the story of the great lakes. But it is the creative design of the website and atmosphere of the site that is absolutely amazing. Sometimes I just have the music going in the background. Brilliant user interface that is both original and fun to explore without being so esoteric that you cant get back to the beginning.
If you want to see how a multimedia site should be done - this is a great example of some super Flash animations and interactions.
Learning areas - Science, SoSE, Maths, and as a great example of digital media.