http://mitworld.mit.edu/video/341/
This is a seminar consisting of medical professionals discussing various topics. One part of the conference focus on alzheihmers, but the rest is concerned with sociability and fear.
Of interest is a study conducted with a chemical which allows your mind to unlearn bad memories much quicker than usual.
The experiment showed "..and reducing fear of all kinds. One example: When people with fear of heights were given D-cycloserine as they took rides in elevators, they reported a significant, long-lasting reduction in their phobias."