Having problems with PwnageTool 4.1 on your Mac OS X? Well, iPhone Dev team has just released an update (PwnageTool 4.1.1) for Mac OS X users, which will help you fix any issues regarding the new jailbreak tool.
PwnageTool 4.1.1 doesn’t have many bug fixes, so you don’t have to worry about the jailbreaking issues. If you can jailbreak your iDevice with PwnageTool 4.1, there is no need to try PwnageTool 4.1.1.
Here’s what iPhone Dev team has to say -
PwnageTool 4.1.1 http://is.gd/g9PDf should fix any issues OSX 10.5.x users were seeing (no need to re-run it otherwise!)

Download PwnageTool 4.1.1 for Mac OS X
[We've removed the downloadable links from our site due to policy violation issues. Sorry for the inconvenience.]
Guides to jailbreak iOS 4.1 with PwnageTool 4.1.1
PwnageTool 4.1.1 is not a big update for jailbreakers. You can use the following guide of PwnageTool 4.1 to jailbreak your devices.
