Some of the ones I’ve read over the last few years are here: http://www.goodreads.com/review/list/2717024-kate?shelf=self-help
I particularly recommend “You Can Heal Your Life” by Louise L. Hay, “The Happiness Project” by Gretchen Rubin, “How to Win Friends and Influence People” by Dale Carnegie, and “This is How” by Augusten Burroughs.
If you ever get depressed or feel suicidal, it is imperative that you get your hands on “Hello Cruel World” by Kate Bornstein.