http://www.astro.washington.edu/kevin/songs.html
The UW's Kevin Krisciunas has written some fun science songs.

http://students.washington.edu/crowther/SciSongs/scisongs.shtml
A list of assorted scientific parodies is at the end of this person's page.

http://www.uninova.com/software.html#Detl_ExpWt32
Curious about how much you'd weigh on another planet? Explorer Weight v1.0 will help you do the math.

http://www.ac.wwu.edu/~skywise/legends.html
There are some great Native American star stories at this site.

http://starchild.gsfc.nasa.gov/docs/StarChild/StarChild.html
StarChild is a learning center for young astronomers

http://imagine.gsfc.nasa.gov/docs/homepage.html An astronomy site for kids age 14 and up

http://www.activeearth.com ActiveEarth shows the real-time movement of the sun across the face of the Earth. Day is shown in bright, colorful detail while the portions of the Earth in darkness are seen in the pale glow of the moon, with city lights shining out into space from major metropolitan centers. A row of clocks below the earth image shows the current time in cities around the world. Users can choose from more than 500 cities or add their own cities.