Do you know who Paul Falstad is? If not, you really need to get to know him, or at least, his web site. He’s a Geocacher, a Java programmer, and a Math nerd. [Editor’s Note: I don’t know Paul, I just read his web site.] The easiest book mark I can access in my web browser is a link to one of Falstad’s applets: A Circuit Simulation written in Java. A very functional simulator, at that.