I usually refer to that distinction as "self-financed" vs. "bootstrapped", where "bootstrapped" implies an alternate revenue stream while building (usually a fu

I usually refer to that distinction as "self-financed" vs. "bootstrapped", where "bootstrapped" implies an alternate revenue stream while building (usually a full-time job or consulting). 37signals, having evolved from a consultancy, is a more classically bootstrapped company. However, in practice, the lines are often fuzzy with companies using a number of instruments to fuel growth.