Google Flu Trends Resource offers up-to-date estimates of flu activity by state based on aggregated search queries.
CDCs Flu View A weekly Influenza Surveillance Report prepared by the Influenza Division.
American Academy of Pediatrics FAQ: H1N1.
CDC H1N1 Flu CDC H1N1 Information Site.
CDC 2010/11 Flu Update
CDC Flu Information for Parents – Child specific information for parents.
Flu.gov Comprehensive government-wide information on seasonal, H1N1, H5N1 and pandemic influenza.