Other
Molecule of the Month: Dna (Java)
A good site that begins with the background and branches into the structure, function and applications of technology. This version of the page requires Java, and should open some applets that allow you to see the structures in 3-D.
Florida State University
Florida State University: Light and Color: Sources of Visible Light
This site discusses primary lighting sources and gives information on the different properties and spectral characteristics of each. Also includes links to some interactive Java applets.
Other
Vlps: Mean and Standard Deviation
Explanation of frequency distributions, mean, standard deviations, and variance including a Java Applet.
NASA
Nasa: Goddard Institute for Space Studies: Time on Mars
This site provides a Java-based program called Mars24. You can download this to your computer to keep track of time on Mars.