
WHO-World Health Organization
The definitive authority on health issues. The health reports on individual countries are particularly useful for travelers
BBC Travel Health
This is so typically British; concise no non-sense advice based on solid research.
MedlinePlus
Tons and tons of links to every possible subject on traveler' health.
UNAIDS
United Nations AIDS program. Read about the AIDS situation in your destination country. Better be safe than sorry...
CDS-Centers for Disease Control
Read about malaria risk in your destination country as well as preventive measures.