Here are some reports I thought you may find interesting.
This 37 page report covers the developments in the changing conditions in learning in K-12 education. No other phenomenon has changed the conditions of learning in K-12 education more than the emergence of virtual high schools. Students in search of an advanced placement course or a course to learn a popular language have to go no farther than their keyboard to find an unprecedented array of offerings.
In this 22 page Special Report, Rick L. Shearer, M.A., MBA, Assistant Director of Instructional Design and Development at Pennsylvania State University's World Campus, and co-founder of Distance-Educator.com, presents his analysis of the concept of interaction in distance education.