Block Scheduling (University of Minnesota)
http://cehd.umn.edu/CAREI/Blockscheduling/

The Case of Block Scheduling
http://www.jefflindsay.com/Block.shtml

Block Scheduling Revisited (Phi Delta Kappan)
http://www.jefflindsay.com/Block.shtml

Block Scheduling - A Solution or a Problem? (Education World)
http://www.educationworld.com/a_admin/admin/admin029.shtml

Wikipedia: Block Scheduling
http://en.wikipedia.org/wiki/Block_scheduling