While there's interest and some new readers, I figured I'd link some of my older posts on swine influenza and pandemic influenza in general for some additional background information and history. Keep in mind that these are unrelated to the current outbreak.
Pandemic influenza series (a bit dated, but still some good information in there, including an overview of 20th century pandemics).
Asymptomatic swine flu infections in farmers
Swine flu in Ohio fairgoers
Iowan has swine flu
New swine influenza virus detected
Masks and influenza
Masks and influenza part II