If you have an interest in human memory you will find these pages an interesting read. It's the story of Solomon Shereshevskii, a Russian born in 1886, and his ability to remember things in frightening detail.
http://www.dreamhawk.com/memory.htm
http://www.ecs.soton.ac.uk/~harnad/Hypermail/Thinking.Psychologically96/0060.html
I wonder what the ramifications would be for mankind if we all had a strange memory such as his.