Open letter from developer on yay-sayers and the failure of a project/company

I remember finding a couple of years ago an open letter written by a developer on a failed project. As I recall, it was a high-profile project in a rather famous, but now dead, company. The main reason for the failure was a culture of promoting yay-sayers and suppressing the people with a realistic view on what could be done in a given time frame.

Does anyone know the letter I'm referring to, and where I can find it?