How To Fight A Bear
A very well done simulation that teaches you what to do if you encounter a bear.
SPENT
Interactive poverty simulation.
Mapping Nuclear Verification
Kick My Habits. How Much Could You Save?
An interactive "game" that shows savings from avoiding habits like smoking and eating out.
Column and Veil
As a website, this is a little annoying (you have to click on all the items before you can proceed). But there are some good ideas for learning design.