Here are the applets for which people have given me links. (Alphabetical by author.) Since Java isn't really "write once, read everywhere" yet, some of these may not run in every browser.
If your applet isn't listed here but you would like it to be, send me mail to tell me where I can find it! Thanks!
Resident Assistant Scheduler by Shaykat Chaudhuri
Asteroids by Ray Crawford and Robert Howard
Connect Four by Jennifer Halterman
Pyatnashka98 by Konstantin Komissarchik
3-D Spinning Globe by Jake Russell
Fractal Map Generator by Tim Stave