This anonymous reddit poster built a viable business turning over $150k/year and making $1k/week of profit, in 4 months.
Then he decided to post an AMA (Ask Me Anything) on Reddit.
Worth a good read, and worth noting once again that building a profitable business and building a hot new startup can be completely orthogonal activities. Maids In Black applies a lot of the tools of the startup world (glossy design, cool attitude, differentiated service, etc) to a domain that many hackers would consider beneath them. The result for the entrepreneur is not beneath most hackers, though: he's doubled his salary and is planning to quit his job in 4 months, once he has paid up his debt.