This is a great essay, makes me feel more on track than disorganised. Point 2, work in long stretches and the fixed cost of re-visiting a program - I think I'll show this to all those who interupt me and that don't understand why I don't really seem like I'm listening! This essay also explains part of why so many big companies are producing code that from a user who can program, you end up thinking "I could do better myself..."