There was an interesting article in this last weeks New Scientist magazine entitled "Befriending the Body Snatchers" which talks about parasitic organisms that

There was an interesting article in this last weeks New Scientist magazine entitled "Befriending the Body Snatchers" which talks about parasitic organisms that take over their host's brains. I can't find an online posting of it, but it talks about things like ophiocordyceps camponoti-balzani (http://www.impactlab.net/2011/03/06/zombie-ants-controlled-by-four-new-species-of-fungi/ http://www.impactlab.net/2011/03/06/zombie-ants-controlled-b...), Gordian worms (http://en.wikipedia.org/wiki/Nematomorpha http://en.wikipedia.org/wiki/Nematomorpha), Entomophthora (http://en.wikipedia.org/wiki/Entomophthora_muscae http://en.wikipedia.org/wiki/Entomophthora_muscae), sacculina (http://en.wikipedia.org/wiki/Sacculina http://en.wikipedia.org/wiki/Sacculina), and also the use of things like Beauveria Bassiana(http://en.wikipedia.org/wiki/Beauveria_bassiana http://en.wikipedia.org/wiki/Beauveria_bassiana) as a way to fight malarial mosquitoes. Interesting stuff, now if only it was posted online... :(