Marc Hedlund's Entrepreneurial Proverbs are great. I don't know if they are all true, because some have to do with phases of startups I'm not familiar with (investor pitches, for example). But for the ones I am familiar with, he's right on the money, for example:

• Build the simplest thing possible
• Solve problems, not potential problems
• Test everything with real people

These are the kind of mantras that should be tattooed on the backs of hands.