Motivating the Non-Paid Help

twjordan asks: "I am leading a small pre-venture-capital startup consisting of two still in college CE majors and two just out of school liberal arts majors. We all own stock in the corporation and we have a small amount of seed money, but we cannot afford to pay ourselves yet. I was wondering if anyone out there could help me with methods to motivate the others in the company. Many of you work (or have worked) on non-paid software projects and deal with this from contributors, but this kind of sits between that extreme and just plain management and motiivational tactics since there is more ownership and commercial intent. Can anyone help us out? Got advice or links to good resources?"