The Omaha Nebraska school system uses open source DotNetNuke for all of their school portals and for the district as well.
Their technology site lists who the staff is along with help on using DotNetNuke modules and they list outstanding websites that are used in the district as well.
I was quite impressed with how school were using DotNetNuke to create their web portals. I was equally impressed with the support these schools get with their Tech Department.
Way to go Omaha!