From this Negroponte email:
Sugar is a very good idea, less than perfectly executed. I attribute our weakness to unrealistic development goals and practices. Our mission has never changed. It has been to bring connected laptops for learning to children in the poorest and most remote locations of the world. Our mission has never been to advocate the perfect learning model or pure Open Source. I believe the best educational tool is constructionism and the best software development method is Open Source. In some cases those are best achieved like the Trojan Horse, versus direct confrontation or isolating ourselves with perfection. Remember the expression: perfection is the enemy of good. We need to reach the most children possible and leverage them as the agents of change. It makes no sense for us to search for the perfect learning model.
I have no comment here—I'd be interested to hear what others think of this paragraph, though. (B)