How do you know an idea is the right one to take action on? How do you sift the really good ideas from the mediocre ones? Phil Libin has been a part of and led a number of companies that have created products that changed the way people work. (Evernote is one of my favorite tools of all time.) His most recent company All Turtles is the mission-driven product development studio behind the video service Mmhmm.

More: Developing Fantastic Products (with Phil Libin).