The Battlefront UBB: All stuff related to CM:BO, CM:BB and CM:AK from the designers of the games

The Proving Grounds Forum: All stuff related to scenario design for CM:BO, CM:BB and CM:AK

Connected to George Paradas Achtung Panzer website, discussions are mainly about German WWII armour and its opponents. Fair amount of traffic.

Run by George Bradford, editor of the excellent AFV News magazine, this is the Internet meeting place for many AFV enthusiasts. If you are having a really obscure AFV related question, you may very well find someone who can answer it here!

Run by Mike Hicks, excellent ressource on everything related to german armour or Third Reich research.

Missing-Lynx Discussion Groups: Here you will find tons of valuable information on allied and axis tanks. Very informed participants. Highly recommended.