I think it's safe to say that no one has managed to summarize the dramas, frustrations, and triumphs of running a start-up quite as effectively as this flowchart, by HackFwd, a European VC firm:
Obviously, the overall message of the flowchart isn't terribly complex--have a good idea, work hard, be passionate--but as with any start-up, the fun is in all the unforeseen bumps along the way.