I am a strong believer in setting positive goals. I believe that goal setting is critical to a person's success.
I have also listed to tapes and read books from a few of the gurus on the topics. I especially like Brian Tracy. To help me get out of the deep depression as I was leaving the organization, I found his message of goal setting and positive thinking very helpful.
That being said, there is a limit. Just like anything else the message can turn very cult-like.