Another follow up on Mac OS X install:
Here's an article from O'Reilly about designing a Unix app install on Mac OS X. There are few specifics that may be helpful, but mainly its usefull for some of its points about what Mac users expect when they install an app. There are, of course, some things that aren't relevant.
http://www.macdevcenter.com/pub/a/mac/2003/10/24/unixapps.html