Second would be Dawn of War: Dark Crusade. This is not an expansion, I'll say that again, not an expansion. It is a complete game in itself which I don't have too much of a problem with as it is pretty good. What I do have a problem with, however, is the 4GB it makes you waste for no reason. You see, it has all the data for all 7 races including the 4 from the first game and the one from the (real) expansion Winter War. The problem is it requires you to have those games installed in order to use those races, even though it has all the data itself. That's copy protection gone mad, a sequel that requires you to have the original installed. I'm going to uninstall the original and hope that when the readme said
if you have Warhammer 40,000: Dawn of War or both Warhammer 40,000: Dawn of War: Winter Assault installed, you will unlock more multiplayer features in Dark Crusade
it actually meant
if you supply the CD key for Warhammer 40,000: Dawn of War or both Warhammer 40,000: Dawn of War: Winter Assault installed, you will unlock more multiplayer features in Dark Crusade
(it does ask you for the appropriate key). Why it requires it for multiplayer and not single player is beyond me, they are roughly equivalent and need the same data.