Ask HN: The most interesting startup case studies in the last five years?

I was just watching Kevin Rose's latest Foundation interview, and I was reminded of what the hell he must be going through with the state Digg is in. Not only did he do a complete redesign of his golden egg, Digg; he didn't preserve the previous design, and after the user backlash reaction to the new design, all he could do was to sit by and watch his whole project atrophy and diffuse to reddit. Another is Microsoft's semi-acquisition of Nokia, and all the choices Nokia made - being the largest handset manufacturer as I recall, which you would imagine put them in a better position to navigate. What other cautionary tales can you think of from the last five years that entrepreneurs should heed the wisdom of? I'm sure that there's at least one good Apple story.