PwnageTool has been updated to 2.01 and has fixed many bugs. You can get the latest version here

It seems that some people have been having problems with the initial release. PwnageTool 2.0.1 addresses the following issues:

• It auto-finds the bl39 and bl46 files better, if they’re on your computer
• It creates the ~/Library/iTunes/Device Support/ folder if not present, which should help with some 1600 errors people have been having.
• Many people have reported the PwnageTool not starting up at all (the icon never stops bouncing). This issue should be resolved now.
• The Sparkle AppCast URL is fixed in this version, so automatic updates should work for future releases.

Because of the AppCast URL fix, we recommend that everyone who downloaded PwnageTool 2.0 get this version, if they want to stay up to date automatically.

N.B: if PwnageTool 2.0 pwned your phone correctly the first time, you do not need to pwn again with 2.0.1.