When the users sync with the computer they go to:
- Mac OS X :
~/Library/Logs/CrashReporter/MobileDevice/
- Windows XP: C:\Documents and Settings\\Application
Data\Apple
computer\Logs\CrashReporter/
- Windows Vista:
C:\Users\\AppData\Roaming\Apple
computer\Logs\CrashReporter/MobileDevice/
The log file names start with application name and have the extension “crash”. They are just plain text files and can be sent by e-mail in original or zipped form, or even copy-pasted into your e-mail program.
From: http://www.anoshkin.net/blog/2008/09/09/iphone-crash-logs/ after a SIMPLE search on google for "iphone crash reports".