It is indeed cool. I don't know anyone with photographic memory but it would be interesting to see what they can do.
I was watching an episode of Angel the other day. He has a photographic memory. He had once had a book that contained a very important passage needed to save the world (as usual) but the book was stolen.
He was trying to write it all down even though he had only seen it once several days ago. It was in an ancient script (again, as usual). His translation came out to be something about a "bucket head" because even on small mistake would change the entire script's meaning. It was funny. ... okay, maybe you had to be there.
In Marvel Comics there is a villian named Taskmaster. His power is "photographic reflexes". He can watch someone perform a physical feat just once and, if he himself is capable of it, can then duplicate the feat.
I wish I had that power. I'd be spending more time watching the Olympics and reviewing fighting tapes!