EWTN has updated their webpage dedicated to Masses celebrated in the Extraordinary Form. If you have not visited this page, it is well worth it. You can listen to audio of the sermons online or download them. Ditto with video clips.
As previously mentioned, those in the various traditional latin Mass communities in metro Detroit and Flint will have recognized the celebrant as Rev. Wolfgang Seitz, ORC. For the most part, he is seen at Assumption Grotto in Detroit, followed by St. Josaphat where he has celebrated the TLM during the Indult years.
The homily on April 6th was magnificent and powerful. It focused on vocations, the priesthood, and the need to pray for priests. I strongly encourage you to at least listen to that homily.
There is a DVD available of the April 6, 2008 Missa Cantata, but it reads that it is temporarily out of stock. I would try ordering it anyway. It's possible they will make them as they need them.