Back in college I actually ran a business in which I provided "study guides" for my peers. I used to average 1-2k a week, more around mid terms/finals. I've always liked to write and was exploring various outlets for my talents. I might do it again once I begin grad school. This actually helped prepare me for my (last) job: working for a consulting agency that specialized in assisting prospective entrepreneurs and startups with their business proposals to venture capitalists. Not unlike L.R. and his helping with business majors but with a lot of money on the table.