This is similar to the idea of Yext (http://www.yext.com/) from TC50.

Any one have links to the evidence mentioned for the effect of positive thinking on performance?

Most of the research on this comes from the field of educational psychology. The specific term that you would search is 'self-efficacy'.

http://en.wikipedia.org/wiki/Self-efficacy

Also "Performance Psychology" which as its origin in sports.

Thanks!