Information about health resources including regionally important diseases such as West Nile, Lyme Disease, rabies, etc. An enormous resource, well organized.

The CDC page for pandemic and avian flu.Note the extensive use of push technologies (RSS feeds) and the Pandemic Flu Leadership Blog.

A terrific mashup of public health information. It demonstrates not just the power of mashups but also how, once a mashup is designed and set up, it can use automated news feeds to update itself on demand.