Dale Carnegie's "How to win friends and influence people", Norman Vincent Peale's, "The power of positive thinking" are my two favourite books and both totally blew me out of the water when I first read them because I had not encountered anything like them before. The power of positive thinking, especially, showed me that you could turn things round just by looking at "the other side of the coin". Third place - there are so many interesting and fascinating books.Tony Buzan on study skills, Napoleon Hill's "think and grow rich", Thoams Harris I'm ok, you're ok, Eric Berne's "games people play". All classic, all useful. All help ypu learn about yourself and others.