FWIW, I posted Data::PropertyList to CPAN a couple of years ago, which supports the "property list" format for configuration data originally used by NeXT.

It's a text format with support for nested data structures, designed to be human-editable, and does not use evals, which puts it somewhere between Data::Denter and Inifile in terms of flexibility.

Apple has switched to using an XML encoding for these data structures in MacOS X, so this file format is probably only of historical interest at this point...