I saw a reasonable TV documentary on this topic some time ago entitled "Survivors Guide to Plane Crashes", which is briefly summarised at http://news.bbc.co.uk/2/hi/uk_news/magazine/5402342.stm

One of the more interesting aspects IMHO was the reason for turning off cabin lights when approaching for night landings: to acclimatise your eyes to the ambient light in case of crash. Of course the cabin crew don't disclose that...

A simple Google search reveals more tips: http://www.google.com/search?q=how+to+survive+a+plane+crash