Sally Kohn: inbox zero started out as a series of 10,000-word posts. She says the core idea is that if you have time to check your email, you must find time to do something about it. The site has since become hugely popular and she's been able to adapt it for different situations in her own life like being an ad computer admin or working with other software developers. "I think inbox zero was probably one of the earlier things that was about productivity, but also about not getting wound up in productivity"