We have updated our Free Maps and Data Gallery in ArcGIS Online http://t.co/gv8Itjmhke Easy GIS for your classroom pic.twitter.com/NmMnYLSIce
— Jason Sawle (@GIS4Schools) May 23, 2014
Check the maps and galleries here.
Click the LESSON IDEAS tab and provide an e-mail and school name to get access to some guidance documents.
And don't forget the day long dedicated ArcGIS Online course at ESRI's Aylesbury HQ