I have learned a great deal following the avian flu story, as a result of my hand in the new Avian Flu blog. Recently we seem to have been in a period of calm, as the flu has been mutating into less lethal forms. This, however, can be bad news, as less lethal forms have greater potential to spread.
One source — Recombinomics– argues that the next pandemic has started already in Vietnam. I find their material prone to overstatement but nonetheless their arguments make for chilling reading and I would not dismiss this outright. Here is another alarmist report.
Here are some puzzles about avian flu.