Wade Meredith of Healthbolt has a neat list of 26 cognitive biases - basically ways our minds distort our views of reality (or why what you think is right is actually wrong!)
1. Bandwagon effect - the tendency to do (or believe) things because many other people do (or believe) the same. Related to groupthink, herd behaviour, and manias. Carl Jung pioneered the idea of the collective unconscious which is considered by Jungian psychologists to be responsible for this cognitive bias.
2. Bias blind spot - the tendency not to compensate for one’s own cognitive biases.
3. Choice-supportive bias - the tendency to remember one’s choices as better than they actually were.
http://www.healthbolt.net/2007/02/14/26-reasons-what-you-think-is-right-is-wrong/ - via Beautiful English Online
Does one of these "biases" consider the potential negative outcome of over thinking and thereby taking too long to make a decision?
Wow. Some of these made my head hurt! Great find!