See http://www.hackint0sh.org/forum/showthread.php?t=1323 for more information. Browse around that particular site to find out more about the iPhone. It seems to work on Mac’s own OS X!
Some people who also have connection to the internet found out the root password and the mobile user account password.
The password for root is “alpine” and the “mobile” user accounts password is “dottie”, but it could also be the other way around.