The Immunization resource from the Society of Teachers of Family Medicine has been updated to an iPhone/iPod Touch app. Simply download "Shots 2010" from the App Store. (Ignore the other apps such as "2000 Shots" as they deal with a very different subject.) "Shots 2010" will be updated in 2011, as it always is.
For users of other devices (Palm OS, Pocket PC), or to use a web version, go to: