I guess the media player in my iPhone invisibly crashed (at least, I never noticed that the app crashed and the phone as a whole certainly did not.) When plugging in to iTunes, I got a popup window saying that diagnostic information exists on the phone, asking whether or not I'd like to send it to Apple. It has buttons for send, don't send, and details. (In retrospect, I should have gotten a screenshot.) The details button opened up a Finder window to /Library/Logs/CrashReporter/MobileDevice/Brian's\ iPhone/ and presented me with two files. I added .txt extensions to make them more readable, but here they are to share:

http://netninja.com/files/iphone/med...1746.crash.txt
http://netninja.com/files/iphone/med...1746.plist.txt

It looks like the one is a stack dump and the other is the same stack dump, wrapped in an XML file format. I'm more familiar with Linux core files and not so much of an OS X developer, but I assume they are similar and that this might help some iPhone hackers. I especially like how the Exception Code is 0x8badf00d.

lol... that has to be one of the better exception codes ever. badf00d!