When you are starting a new company, its often hard or impossible pay everyone for services they can provide. Some people may be willing to work with\help you build your dream in exchange for equity in the company rather than for money.
Unfortunately I do not know of any website that facilitates this sort of employment. Craigslist comes to mind immediately but I feel that if you are on Craigslist looking for work, chances are that you are also looking for money.
Are there any websites out there that do this? Anyone want to start one? :)