I would like to use this thread to add all the things we've learnt regarding kata bunkai from reading Iain's books, articles, newsletters, watching videos etc.
I'll start off with a few:
1. The 'inactive' hand does one of the two things:
a) it moves the opponents limbs out of the way, or
b) it tells you where the opponent is.
2. Angles are important, that is when kata shows a movement at an angle it means that you have to move to that angle in order to avoid being hit and/or be in a better position compared to the attacker.