The department of travel medicine provides up to date information on vaccines and how to avoid nasty things like malaria and travelers diarrhea. (London)
http://thehtd.org
Center for research and training in health management in developing countries, located in Heidelberg, Germany. Links to references and research sites.
http://www.hyg.uni-heidelberg.de/ithoeg/index.htm
Provides information on research conducted on public health issues in tropical countries. Links, meetings and publications are included on the website.
http://www.liv.ac.uk/lstm/Well_Trop/