well, you could say all those things whilst you pack your desk up!
Actually, I have to say there is no better feeling than walking out of a job in the middle of the day. With a parting shot of what a complete and utter wanker the boss/colleague is. The sense of relief is wonderful.
Suppose it is finding another job in this climate that is the prob.
Just smile sweetly and think 'god you are an arsehole' when you are dealing with these clients, and make sure they drop back a few spaces on the list for whatever it is they are wanting.