[Enhancement] Allow one-step installs (see the "What's New" documentation for more information on how this feature can be exploited to provide a better user experience).
[Enhancement] To increase awareness that Install is also actually an uninstaller, show the "Uninstall" button as ghosted rather than hiding it completely when Install is first launched (feature request #579, "Display Uninstall button even if no previous install detected").
[Enhancement] When resizing buttons to smaller sizes instruct the superview to redraw in that area also. The previous behaviour was not known to be defective, but this change should proof the code against possible changes in future versions of Mac OS X.
[Bugfix] Workaround Cocoa bug in which the sizeToFit produced buttons that were marginally too narrow.
[Note] Now ships with unstripped nib files; at the cost of a small increase in download size developers can now edit the nib files in Interface Builder.
