[brokencup]

GiveWell[1] and Open Philanthropy[2] would probably be of interest here. (I am a donor to some of GiveWell's recommended organizations but otherwise not affiliated with them)

[1] http://www.givewell.org/

[2] http://www.openphilanthropy.org/

[melling]

I've recently donated to the mosquito nets. I don't see where they recommend institutions for medical or scientific research.