Hehe, try this one out if you want a better working simple world conquest game:
http://triplea.sourceforge.net/mywiki
It's an open source clone of Axis & Allies, and the AI works better than the one in World Supremacy, and it's got a lot of maps. Try the latest unstable version (release candidate), because it's better than the last unstable, and the AI works better (and it's faster). But don't use the Dynamix AI (in Version 1.3.1.1) for England, USA or Japan in WW2-scenarios, because it can't move sea zones yet (but it's better in land battles than the two other AIs). Just use Moore N. Able or E.Z. Fodder for them. Try it out, it's free!