My strategies come from a multitude of sources. A lot of it comes from reading this board, especially posts by JasonC, that guy knows his stuff. I also have read the American handbook on the German armed forces, and I've got some general ideas from that. It's available at http://carlisle-www.army.mil/usamhi/DL/chron.htm#AWorldWarII19391945
However, most of it actually comes from my own ideas and gut feelings. I think that you can analyze stuff all you want, but to me it just comes down to what I think will be the best strategy for each engagement. Also, know your men and their equipment! Tactics that may work for the Germans may lead to defeat with the allies.
One of the great things about CMBO is that you can use a multitude of tactics to solve any given problem.