Property Lists (plist) is a format used on OS X as a way to store settings and other configuration data, as part of my SQLite talk I show how to extract SQLite databases from the backups generated for the iPhone when it syncs to your computer.
Simply, its an XML format that stores a data structure consisting of boolean, integer, real, string and blob values. I've provided the parser I use to extract data from the PList file, it doesn't work with binary plists at the moment. But may do so in the future, you can convert a binary PList to an XML PList using the plutil binary on OS X.
Instantiate the PlistParser class and then call the parse method with the filename as a parameter. This will then return an array of the PList elements.
If you have any problems add a comment and I'll look into it.