Link includes an Empire campaign and mod making tools (allowing you to unlock tons of content included in the demo but not used). Turns out the entire game is described mostly by xml files, making it extremly easy to change the demo campaign, units, planets, and almost everything else in the game.
the link to the digg story is here (
http://www.digg.com/gaming/_Star_Wars:_Empire_at_War_demo_hacked_two_days_aft) er_release)
and the actula story is here (
http://www.technical-difficulties.com/hacks/eaw/)