We have just completed a new version of PodcastUtilities, it now supports a post download command. Using this command its easy to hook up utilities such as MP3Gain or any other post processing command. This build also contains some bug fixes including support for running the utilities from UNC paths.
There is a ready-to-go compiled Windows version available to download, which includes the utilities and documentation.
We are planning to take a bit of break from working on the utilities but we will still continue to maintain the code and fix bugs.