Influenza Genome Resources
There are a number of resources that provide information about influenza, but perhaps the most useful is the Influenza Virus Resource from the National Center for Biotechnology Information. This website gathers Influenza sequences from the NIAID Influenza Genome Sequencing Projects, and provides access to the data free-of-charge, as well as useful tools for both annotation and analysis of the seqences. Furthermore, you can easily access good information about Influenza viruses, as well as links to other Influenza sequence databases.
Another useful resource is the Fluwiki. This site also brings together many different resources (with links), as well as providing information on Influenza virus and pandemics. The National Instutitue of Allergy and Infectious Diseases (NIAID) also has a good website on Influenza virus, both for lay people and for reserachers.