There was an interesting story in The New York Times on breakthroughs by neuroscientists in eliminating memories. The simplified process is this: add a chemical called ZIP to a specific part of your brain and the connectors needed to retain a certain memory are eliminated. The doctors and scientists working on this say that it could do wonders for people with post-traumatic stress, addictions, phobias and memory loss. The story really is fascinating and worth a read.
A Wired magazine reporter talked to an ethicist about all of the potential unforeseen consequences, one being small, false memories could be created. This is worth a few minutes to read too.