Editor's note: This article was originally published on February 1, 2008, and has been updated. It was excerpted from our Coin-Operated Laundry start-up guide, available from Entrepreneur Bookstore.

Looking for a business idea that doesn't eat up your time, provides stable cash-flow, and gives you great ROI? How about owning a laundromat? These simple, local, cash-flowing businesses have been ...