photographic memory - is it possible to teach your brain to have one, or are you just born with it (or not)?

I read an article somewhere which outlined a technique for developing a photographic memory (I didn't intend a pun) Which goes something like this.

Place Four Items of sequential Personal importance around a room and assign what you wish to remember to each item, again relative to the importance you place on the order of the information you wish to recall.

I did find some personal gain from the technique at the time, but, I have to admit that I long since regressed to previous methods.

Me, i was Personally was born with a photographic memory.
And still have it to this day. It was found i had it when a child when a test of some sort was done, remembering things, along the par of reading and spelling tests. If i could project what i can see in my mind onto a wall, it will be in exact detail as i saw it.
Darren Brown taught a bloke how to remember things to win a pub quiz he had never been to before, he was made to read for a week just read and read and read. But Darren taught him how to memorise what he read by assocation with certain things. Surfice to say he beat the champions at this Pub quiz. So yes it can be taught and one can be born with it. With me its an object that can trigger that memory off. (some not so pleasant.)