Avian and pandemic influenza
Nature paper on the architecture of ribonucleoprotein complexes in influenza A virus particles
Science news item on genomic analysis of the H5N1 strain
A Congressional News Service (part of the Library of Congress) report on domestic preparedness efforts for a pandemic. A US Department of State report called Meeting the challenge of bird flu.
(I am very grateful to the New York Academy of Medicine Library's Grey Literature Report for the last two of those).