Lucas has done the following things besides Star Wars.
THX 1138
American Grafitti
More American Grafitti (made a whole 10 cents on it)
Howard The Duck (faired a little better. Made a whole quarter)
Willow (did better than Howard...made 50 cents)
Indiana Jones Trilogy (as producer)
The Young Indiana Jones series (don't know if he directed or not since I never saw one episode of the show)
Well, that's all I can remember at the moment.