I got out of it back when I was in college by going in and randomly saying I was moving to California the next week... they dismissed me. However, that was the dinky muncipal court, so they really didn't care.
My dad has a medical waiver out of jury duty due to 3 back surgeries and an inability to sit for long periods of time. Basically he had his pain doctor write a letter, and anytime he gets a notice he goes to that court's office, and they relieve him. I dunno if this is an option for you, though...
Other than that, it's really hard to get out of.
