Photographic memory is a fascinating ability. So far I have only known a couple of people, that exhibited this trait.
One fellow showed this ability on several occasions. While meeting with his classmates for a group study, one person mentioned a particular point a professor had made. This fellow who had photographic memory said "no that's not right. Don't you remember when he said this" and he went on to write down an entire derivation that the professor had written on the blackboard several weeks earlier.
Another person I knew could easily learn some material if it had to do with recalling information. She could essentially read a book and be able to recall verbal descriptions as well as images, in great detail. However, with age she lost this acute ability.
With the advancement of genetic study, we may find the DNA sequence, that codes for photographic memory. We can already transfer DNA between species, so the technology will be there, (if we desire to use it), to transfer this trait of
photographic memory (as well as other traits) to our offspring. This will probably be the closest we come to implanting photographic memory into someone else.
Downloading the memory of someone, is an equally fascinating topic. Once we have a clearer understanding of how our brain works (as is being researched in artificial intelligence and neural networks), how information is stored, retrieved and processed; then we may have a chance to download someone's memory (perhaps into a pensieve

).
Daevren, interfacing the human brain with silicon circuitry is not
scifi any longer. We have already implanted circuits on silicon chips that are contiguous to the part of our brain that controls motor function.
Human thought (firing neurons) can now enable a paralyzed person, to control a robotic arm.
see ---> http://www.technologyreview.com/articles/05/03/issue/feature_implant.asp?p=0
Research in this area was not successful overnight. They started with lower primates first. I remember when they aired a program on PBS that showed how a monkey could
use its mind to control a robotic arm miles away, via the internet.
--->
http://www.sciencedaily.com/releases/2000/11/001116080512.htm
So it is certainly not out of the realm of possibility at some point, to interface RAM with our minds. Think how tremendously it could improve its efficiency. But then we would no long be humans but an animal-machine hybrid. Then those with artificial organs may already be considered hybrids.
