The root and another "mobile" account password of iPhone OSX 1.0, have been obtained from a passwd file and been cracked by the famous fellows from hackint0sh.org. The hash turned out to be old plain 1979 DES. Sadly this is not of any use so far, as the iPhone does not (yet) present us with a nice and tidy login screen to explore it's system.

Original: http://www.hackint0sh.org/forum/showthread.php?t=1323

The password for root is "alpine"
The "mobile" user accounts password is "dottie"