www.neoformix.com/Projects/TwitterVenn/view.php

The Twitter Venn applet allows you to enter 2 or 3 search terms and searches Twitter for matches, then presents the results as a venn diagram, which illustrates the rate of tweets containing the search terms in the various combinations.

http://www.neoformix.com/Projects/TwitterVenn/view.php

koolpianoz.com

This applet allows you to play the piano and will accompany you on different predefined songs.

Needs Java 6 to run properly.

http://koolpianoz.com/

JPL Small Body browser

This applet shows 3D orbit visualization of planets and small bodies (asteroids). This is quite interesting in itself, but especially today, as Asteroid 2009 BD is passing relatively close to the Earth today.

http://ssd.jpl.nasa.gov/sbdb.cgi?sstr=2009%20BD;orb=1