I have found several places on the Net that have this kind of information. Try my Index of Education Sites as a starter. Also have a look at the numerous entries that appear in one of the search engines at the top of my Hotlist such as InfoSeek or Yahoo under astronomy education. Don't forget the NASA site called QUEST and the NASA K12 Education Initiative which you can get to by going to the NASA Homepage. These are found over at the MArshall Space Flight Center. The Goddard Space Flight Center also has an Education Homepage too.