I enjoyed this worthy article by essayist and programmer Paul Graham: The 18 mistakes that kill start-ups. Anyone planning to launch or grow a business should read it, and then print a copy for reference.
My only comment would be to expand item #12 to read: Spending too much or too little. Business owners can often gain ground by focusing on what they’re good at, and delegating the rest.
Not too long ago, Webcopyplus interviewed business expert Mark Wardell to discuss this exact topic. In the article Delegate or die: 6 steps to business growth, Wardell explains many entrepreneurs don’t employ this vital tactic because they fail to place value on their time.