COuple more sites

www.literactive.com - this one says you have to register and implores you to read the terms and conditions first... except there's no link to the terms and conditions and when I emailed to ask where they were, the email address was unknown.

www.windows.ucar.edu
key phrase 'supported text' (and other stuff from uoregon.edu )
www.starfall.com - other good stuff for beginning little guys