I've had a few people get confused on getting their podcast into the Zune Marketplace. So here is what I know.

Where is the Zune Marketplace?
Much like iTunes is not a website, its a software program. Inside iTunes you have the "Podcast Directory." Inside the zune software, you have a "Marketplace" and in the marketplace you have podcasts.

How Do I Submit My Podast to Be Included in the Zune Marketplace?
1. Download and install the Zune software. (new window)
2. Start the software and click on Marketplace at the top.
3. Click on Podcasts down a bit and to the left of the word "Marketplace" at the top of the screen.
4. Scroll down and you will see an option near the center/right side of the screen that shows " suggest a podcast ".
5. Enter your RSS feed (or feedburner feed if you're using it) and click Submit.

I'm not sure of the time frame it takes to get listed, but I'll keep you posted.