How to make Open Source buisness models viable for early Startups?

rchoetzlein writes: "I am software developer working independently for 5 years on various projects, and preparing to go public with my first product. Everyone is telling me I should make it Open Source. I would love to, but I just don't see how an early startup can afford to become profitable on service alone. My projects are no longer small scale hobbies, they are large frameworks, and I need to make a living. Any ideas on business models that would allow me to open source while guaranteeing I can feed myself?"