I spent some time working on a project to produce an in online game for chemistry students. Most of this time was spent producing questions and then translating them into most European languages.

The result is a professionsal fun game that has the great advantage that students from across Europe can compete against each other live in their own language.

The game can be found at

http://www.molekult.no/intro.swf

A rather large download is required to play but it is worth the trouble