I've been a technical director of a podcast for quite some time. I wanted to track podcast usage, and at the time I wasn't aware of services like podtrac.com. Even if I was, I'm wary of letting other domains be involved in how users end up listening to the podcast. So I've been working on a podcast tracking system. I'm not particularly looking for critique here, but it would be welcome - I'm just looking for ways to give others access to this system, if they're less technically inclined than most.
Anyways, you can download the package here. My feed is at http://dongbufeng.net/twilight/podcast/VolturiCastleFeed.xml, so this system should be unzipped to the /podcast directory.
Usage: Any file in the /podcast directory can be tracked by replacing '/podcast/' with '/podcast/tracker/'. For example, you're hosting a ZIP file, and want it's downloads tracked. Instead of giving out the URL http://dongbufeng.net/twilight/podcast/files/foo.zip, give out http://dongbufeng.net/twilight/podcast/tracker/files/foo.zip. It'll also pass through any URL arguments, and the arguments will be present in the log. The /counter/index.php file parses and aggregates the log file, giving an overall hit count, as well as per-file, per-IP, and per-country hit counts.
I also implemented a feed builder, making it much easier to add, edit, and delete episodes without ever having to work with the XML feed file. This tool, along with a collection of other useful links, is available at /admin/index.html.