Gestalt.Net is a simple to use library for application configuration. It allows for more flexibility, easier to use, and more powerful than the app.config/web.config, registry, or INI files. It handles encryption of config files automatically. Also due to its OO approach, most changes, etc. can be dealt with in code instead of modifying an XML file. It's developed using a utility library found here http://cul.codeplex.com, however a compiled version is already in the download file (however you may wish to strip out the parts of the utility library that are important and compile against that to reduce the size). It can be downloaded from here.