Well, if you have not done so already I would strongly advise you to check out some of the following initiatives which have resulted in very exciting and educational suites of games:
- edubuntu [4] which includes the gcompris [5] suite
http://gcompris.net [6]
- childsplay (available on Linux, Mac and Windoze)
http://childsplay.sourceforge.net/ [7]
There are other applications which are very useful. But these 2 suites are very comprehensive and can assure you hours of educational fun.
Links:
[1] http://pulse.veltsos.com/category/perso/general
[2] http://pulse.veltsos.com/category/perso/kids
[3] http://pulse.veltsos.com/category/it/software
[4] http://www.edubuntu.org/
[5] http://gcompris.net/
[6] http://gcompris.net
[7] http://childsplay.sourceforge.net/