A thought provoking article here (via Daring Fireball).
Reminds me of the 'unconsciously incompetent, consciously incompetent, consciously competent, unconsciously competent' progression of learning (or, if you're familiar with the language, the Square: D1, D2, D3, D4). Also contains a cutting observation, and Tolstoy quote, about pride being an obstacle to learning/change.
