There is a new tv show just out called ‘Unforgettable’ about a detective who never forgets anything. Although this sounds like science fiction, in fact it is a known medical condition diagnosed in 2006, as ‘Hyperthymesia’.
Marilu Henner is a well known actress who also has this condition. She is interviewed below: http://www.cbsnews.com/stories/2010/12/20/earlyshow/leisure/celebspot/main7167813.shtml
This has a very interesting video attached to it. Although this sounds amazing would it not also be exhausting? How much memory would you like?