Residents are having more difficulty finding moonlighting opportunities because of the 80-hr work week laws. How about some non-clinical moonlighting? I know several residents who are generating quite a bit of supplemental income by writing and blogging in their spare time (how many residents really have spare time?).
Interested? If you enjoy writing, then maybe you should explore some writing opportunities. Perhaps you'll find yourself developing a parallel career as a physician (as you go through residency training) and also as a professional writer (as you moonlight as a writer/blogger).