Kind reader Matthew M. did a bit of Web archeology and found the lost Louth lectures:

Your question about the Louth lectures picqued my curiosity. I found the originals Dan Greeson had posted here, on the website of the lecture location:http://stgeorgecathedral.net/sermons.html (in Windows Media format). On that page are a number of other interesting lectures.

Since the wma format is inconvenient, I converted them to MP3 files here:

The Relevance of the Church Fathers today
Maximus the Confessor and Modern Science