For those planning to be on the bleeding edge and upgrading to OS X 10.7 Lion, please be aware that there is a new version of CornerFix, version 1.4.2.0, available. Earlier versions may crash with Lion.
You can update now - the new version is compatible with all version of OS X from 10.4 onwards.

There are also two other upgrades (which apply to the Windows version as well):

1. Fix for an issue that could result in Lightroom displaying an out-of-date thumbnail if the image had been loaded into Lightroom before processing with CornerFix; 
2. Lens detection for the new Leica lenses. 

You can download from the usual place.

Enjoy.

Sandy