Tx G Mom's link reminded me of some earlier examples of my son's memory.
At two, my son would take five minutes to put together a 35 piece jigsaw puzzles, then the second time he put it together only to took him 30 seconds. Even earlier than that, my son started to "read" at 18 months, until we realised he was just reciting the words- a great start to actual reading (he then started properly reading at two). I have millions of examples!

It's funny, some of the examples other are giving about eidetic memory in adulthood actually sounds like what I can do. I didn't realise that there were different types.