I started a Snowboard shop and a concert / party promotion business in college. I also worked tom make sure that I made money. The Snowboard business basically funded my snowboarding habits. The concert business was a ton of work and lots of fun and I learned a ton working with record lables, venues, marketing, advertising etc. I took home a few thousand for lots of work over a year. I think starting a business in school will not bring you lots of $$$ but it will teach you alot and look good on a resume, remeber you do not have to say how successful your business was on your resume. After college these experiences motivated to start my own business. I have started several since college, some successful and some utter failures. My last venture was a multi-specialty clinic which ultimately led me to apply to med school.