Evil Enemy God. (My players stay out, please.)

[William Ronald]

You might also want to check out Canonfire for some articles. It is also a tremendous resource for the World of Greyhawk.

Another place to check would be Dragonsfoot, a good source for information on earlier editions of D&D,

 

[Aaron L]

Don't forget Orcus has a galactic empire! He's like Horde Prime!