Very good thread !
I'm going to put a spanner in the works now because we communicate around 80% using body language and about 20% verbal.
From the moment you walk into the interview, the interview itself and when you walk out you give off body language.
Get a book on body language, one which relates to interviews and work, study how to create a positive, confident impression on the person you are speaking with, believe me the interviewers are usually experts in this and can see all this..... e.g. you say your answer is "yes" but you eyes and face say no.....
Good luck
AG