AMPS - Armour Modelling and Preservation Society - http://www.amps-armor.org/ampssite/default.aspx . The Armor Modeling and Preservation Society was created to associate interested individuals and organizations in both sharing an interest in the history of armored vehicles and in cultivating interest in armored vehicles and related subjects via the hobby of modeling.
Achtung Panzer - http://www.achtungpanzer.com/achtung-panzer-home. This website is dedicated to the history of tanks and people of the Panzertruppe during World War II. It describes most of the tanks and conversions used by the Wehrmacht and Waffen SS Panzer Divisions from September of 1939 to May of 1945. It also describes some of the Panzer Generals and Aces along with other information related to the Panzertruppe.
IDF Armour -http://idf-armor.blogspot.com/ - IDF armor and tanks history and special close up pictures - good source for modelers.
KMK Scaleworld - http://www.kmk-scaleworld.be/ - What started out as a three-man-conversation in a corner of a well known pub in Herentals almost 30 years ago, has grown over the years to a flourishing, even international, modelling club in which all facets of modelling are practised.