I worked through this applet and performed a couple of the suggested experiments. I found the pendulum w/ rotating suspension force very interesting. The experiment stated that while balancing a pencil on the tip of your finger is very difficult, balancing a pendulum in the upright position is very easy. I found this to be very interesting and I tried the experiment myself using the given applets.
The applets are very easy to use and the instructions are very helpful. The lecture room provides an information base for those unclear on the theories involved. Nice Site.