I also have a slight enhancment, which I already submitted to Darrell Walisser:

In the SDL target template file "Application.trgttmpl" (contained in
the PBProject.tar.gz archive), replace
     CustomProductSettings = {
     };

with
     CustomProductSettings = {
         NSPrincipalClass = "NSApplication";
         NSMainNibFile = "SDLMain.nib";
     };

This automates two steps mentioned in the Readme when creating a new
"SDL Target" in Apple's ProjectBuilder.