The International Association for K-12 Online Learning reports

There are some on the website of the the International Association for K-12 Online Learning (as you might gather, from the "K12" to mean "school", this was originally a North American organisation). One series (4 papers so far, from 2008) is Promising Practices in Online Learning, which "explores some of the approaches being taken by practitioners and policymakers in response to key issues in online learning." They are not exactly indepth, but, for example, Blending Learning: The Convergence of Online and Face-to-Face Education has a brief introduction to what blended learning means and then has several short accounts of what specific North American schools are doing.
http://www.inacol.org/resources/promisingpractices/index.php

Photo by Sheila Webber: Froth of cow parsley, Hellingly, May 2009