Most introductory textbooks usually only display the current and charge versus time graphs. This simulation only allows for the voltage-time graphs. It would be nice to see the other graphs.
General Comments on Quality: Overall the quality of this simulation is good. The theory explanation (and the confusing symbol characters) should be left totally out. These seem to added as an after thought, and are not necessary to meet the goals of this tool. Making it easy for authors to download and host the applet locally would allow for customized support material.