The podcast is typically an hour long, and features Celtic/folk music in many different styles and by musicians from many countries. There's a lot of variety, and Marc's hosting is down-to-earth and warm. I may be a little biased, as the podcast has featured my music several times, but I can say that I was a fan of the podcast long before I ever sent any music to them for feature.
So, I encourage you to check out the Podcast, either by searching its name on iTunes, or by following this link, where you can stream it for free. I'm sure you won't be disappointed!