An interesting idea is that of Cellular Memory. In essence it postulates that personality, intelligence and memories are not entirely local to the brain. This is not a new theory, but of late there is some anecdotal evidence from transplant patients of memories and personalities that they claim could only have come from the donors.
This is not necessarily as crazy as it might at first seem. In ancient Greece many believed the heart to be the seat of the soul. The brain has only relatively recently been assigned the functions of memory, intelligence and personality. And while there is no doubting that it has an enormous role to play, this does not rule out the possibility that other organs have a role - however small - to play as well.
Studies of planariums (a type of primitive flatworm) have shown that if a group of planariums was taught a behaviour (such as avoiding a light source), then minced up and fed to a group of planariums that hadn't learned the behaviour, the group afterwards demonstrated the same light avoiding behaviours.
Of course, cannibals have known this all along, eating the relevant parts of their victims in the hopes of recieving the appropriate benefit - the heart for courage, brain for intelligence, etc.
No serious emperical studies have been done on this topic so far. But if you're still curious there is some anecdotal evidence that would seem to support at least the thought that perhaps more study is required....
Further reading: Daily Mail & www.scienceray.com