A great new site from Garry Simmons, who has really taken ArcGIS and explored what it can do in the Geography classroom. He's also shared what he can do in a number of places, but now has the Serious GIS website, where materials will be appearing over the year ahead.
You may wish to read about a regional CPD day in October that Garry is organising with Jason Sawle of ESRI. Details here (PDF download)
At £25 for the day that looks like a bit of a bargain !!