Here are some more apps (as if you didn't have enough already!)
for your new iPhone or iPod touch, with a medical diagnostic twist:

Heart Imaging Technologies, LLC introduced a solution that allows medical images to be viewed on an Apple iPhone or iPod touch.
See examples at http://www.heartit.com/index.html
Physicians would click on a web link sent via email, enter their password, and, view movies of a patient’s beating heart. They can even put their colleagues on speakerphone for a medical consult while simultaneously browsing through the imaging results.

Here is another piece of news about the availability of MRI's and CAT scans on the iPhone so that life-saving treatments, for things like strokes, could be delivered sooner.
http://calgary.ctv.ca/servlet/an/local/CTVNews/20080730/CGY_iphone_universityofcalgary_080730/20080730/?hub=CalgaryHome

and lastly, promised apps: here is a recent article about the health and medical apps available for the iPhone:
http://www.technewsworld.com/story/mobile-tech/64269.html?wlc=1219997691

My current favorites apps are ePocrates, a searchable database of medications, dosages and interactions and eponyms which is not mentioned in the above article. Eponymous medical signs are named after a person or persons, usually the physicians who first described them, but occasionally named after a famous patient with the signs, e.g., Lou Gehrig's Disease after the famed New York Yankee slugger whose death in 1941 was caused by this disorder.