HealthMap brings together disparate data sources to achieve a unified and comprehensive view of the current global state of infectious diseases and their effect on human and animal health. This freely available Web site integrates outbreak data of varying reliability, ranging from news sources (such as Google News) to curated personal accounts (such as ProMED) to validated official alerts (such as World Health Organization). 
 
The site is sponsored by the Children’s Hospital Informatics Program and the Harvard-MIT Division of Health Sciences & Technology. Even it has not all the existind diseases, it shows a very good representation for many of them. The data is collected automatically from many sources and displayed in the Google Map Api. It’s a very nice job and hope this helps many organizations.