I just wanted to share a great link with you. A very dear person in my life found it for me a while ago, and it has helped alot with depression in my life. It is operated by the Australian National University, and it's a great hands-on environment to learn about moods (and how they affect us.) If you can't afford or don't have time for cognitive therapy, this is very helpful.
Give it a try - do the exercises and take your time. People who suffer with Bipolar Disorder or Depression could learn quite a bit from it. I sincerely hope that you do try it. If you come across and tools online (or offline) that have helped you, please feel free to drop me a comment.