I just read a short article (here) that says "The Discovery Health Channel will air a documentary Saturday (Jul. 19) called "Transplanting Memories" which delves into the eerie mystery of organ transplant recipients who experience memories of the organ donor."
I did a little research and I found there is a small body of evidence that exists for biochemical memory in flatworms.
McConnell, J. V. (1962). Memory transfer through cannibalism in planarians. Journal of Neuropsychiatry, 3, 42-48.
McConnell, J. V., Jacobson, A. L., & Kimble, D. P. (1959). The effects of regeneration upon retention of a conditioned response in the planarian. Journal of Comparative and Physiological Psychology, 52, 1-5.
Anyone ever heard of this?