I do not think that this is quite what you are looking for, but I found ithis.
http://news.bbc.co.uk/1/hi/health/1263758.stm
They transplanted the head of one monkey to another monkey's body, but It died after. They argument for it was shot down, but what the scientists succeeded in doing was keeping a foreign brain alive with a new set of heart/kidney/liver ect.
