A nice collection of helpful articles can be found at The Encyclopedia of Educational Technology. From San Diego State University.
You can preview a fairly good collection of "Edutainment" software from Scholastic at Downloads2Go.During the trial period you get a fully functioning copy of the program.
The Number Devil is a CD program for upper elementary students. Based on the book of the same name by Hans Magnus Enzensberger, the Number Devil presents advanced number concepts as beautiful and fun puzzles. A great supplement to the book and strong enough to stand on it's own. From Vivia-media.com.
Winged Sandals is a wonderful series of animated stories and games about Greek Mythology. The site was created by the Australian Broadcasting Corporation and the University of Melbourne.