[jamieomatthews]

The biggest thing for me is excess decision making. I'm a programmer, and when my day require making 10 or 20 design decisions, things really start to slow down. (this can lead to some of the other things on this list, like feeling tired, feeling stuck, surfing the web, etc, as it leaves me drained).

I think at the end of the day, our brains have a limited power to make tough decisions, and it's wise to clearly define a programmers tasks so he/she doesn't have to make them.