Plane Sailing
Astral Admin - Mwahahaha!
Get yourself a copy of the d20 Modern Menace manual. It is the best adversaries book I've seen for any game, ever.
Easiest way to get a copy?
The SRD on the WotC website
d20 ModernSystem Reference Document
Thank you, Jonathan Tweet.
(Miss the pictures? the art gallery is here http://www.wizards.com/default.asp?x=d20modern/article/20030923a)