This was the most codex-faithful mod for the original Dawn of War game, and now it's out for Winter Assault as well!
Almost every Imperial Armour tank, including the Vanquisher, Demolisher, Executioner (my favourite), and Stormblade, is in this mod and with all kinds of
WYSIWYG upgrade options. Commissar Yarrick also makes an appearance with his laser eye thingie.
http://dawnofwar.filefront.com has it as their latest news item. I consider this mod a Big Deal as it's pretty much higher in in-game production quality than the generic/Cadian Imperial Guard as presented in the official expansion pack Winter Assault (cost me $30!). EDIT: I did NOT want smilies in the topic (which are OBVIOUSLY broken!). I can't seem to fix this myself.