Mostly Flash-based, the games run the gambit from the sublime to the mundane; but over all, the site is fun and full of tons of auxiliary information. While some of the little adventures were obviously put together for younger students, the texts, lessons, and ideas are often quite advanced and more than applicable to students of all ages.
The games range in style and pedagogical purpose, with some, such as 'Lord of the Flies', serving double duty as both a reading check and a source for further biographical and research purposes; and others, such as 'The Ear Pages' used to help explain complex scientific concepts.
I particularly liked the Peace Prize page's interactive 'Conflict Map' which asks the simple yet disturbing question:
In the course of the 20th century, mankind experienced some of the most devastating wars of all times. Where did these wars take place?
The answer forces students and teachers alike to confront some pretty harrowing realities.
For more in depth research and information purposes, the site hosts an excellent overview of all of the Nobel Laureates with internal links to biographies, photo sets, and transcripts of their Nobel acceptance speeches.