A friend has been putting together some finance applets for fun and study on his website, and you're invited to have a look at them, and have a play.
Much like Carl Weiman's fun and functional applets to help discover and understand the basic concepts of physics (which I mentioned here), the finance applets are intended to help make complicated financial concepts easier to calculate, and a way for my friend "to learn and understand mathematical modelling in financial economics."
Enjoy, and please do leave feedback -- it will help to refine both the applets and the site.
Linked Sites: Mathematical Financial Economics - Sione Palu
Interactive Physics Simulations - Carl Weiman
Related: Economics, Science, Geek_stuff