Here here. Most startups get to step 2 without ever achieving step 1, and so they flame out. Get '4 Steps to the Epiphany.' Drop everything and read it. All will become clear.
- An advisee/investment of Steve Blank, started IMVU.com, Venture Advisor at Kleiner Perkins) His blog has become somewhat less useful lately though as he's been using it mostly to promote his "Lean Startup" classes.