ArcLessons is a resource for you to share lessons for using GIS in the classroom. You can browse a list of lessons by category or use the search tools to find lessons in your area of interest. You also can contribute your Lessons or LessonPaks to ArcLessons for other educators to use. "
"The one hundred or more posts that I've written about Google Maps over the years is indicative of how much I like what can be done with Google Maps in classrooms. That said, when you're ready to move beyond basic placemarks there are more robust mapping tools than Google Maps. One of those tools is ESRI's ArcGIS Online.
ArcGIS Online is an expensive product for anyone that is not in a K-12 school. If you work in or attend a K-12 school then ArcGIS Online is free through ESRI's ConnectED program. Click here to apply for a free subscription."