I'd be interested in seeing case studies on different startups that have applied the Lean Startup approach. Not so much explaining the theories it embodies ... just a "preaching to the choir"/examples book. I'd especially be interested in seeing cases where — even when applying his approaches — companies failed for some reason. It's not that I'm against Eric Ries's methodology or theories (I'm actually a big fan) ... I just would be interested in seeing examples where it didn't work for some reason, and to hear why those companies felt it didn't work.