When I started the podcast in October of 2010, I used a host service called blip.tv. Unfortunately in December 2011 blip stopped supporting podcasts and I had to switch to Podomatic. Podomatic did not seem to the answer to my situation either, as I frequently hit bandwidth limits because of my weekly schedule. So, in the fall of 2012 I moved to a self-hosted solution.
You can subscribe in iTunes using that button over there on the right. Or you can subscribe using another feedcatcher using the link just below the iTunes button. Or you can completely forgo subscribing and just listen to the podcasts on the blog posts on Friday using the embedded player. So many options!