I was having a lot of trouble jailbreaking 1.1.2 using just the Conceited Software files on Leopard. The only way I got this to work (twice) was to have the "ost" folder (libreadline – available here) unzipped in Macintosh HD. And all the 1.1.2-Jailbreak files from Conceited Software unzipped, loose on the desktop. Then I ran the "jailbreak.jar" from the desktop, and it worked. I hope this helps anyone else having trouble on Leopard as well as the Jailbreak developers (may need to add a step in the ReadMe Please Register or Log in to view images.