Excerpt from:  Frequently Asked Questions (FAQ)
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Can I use my blogsite to publish podcasts?

Yes.

Blogsite supports Link Properties; a model for creating lists of links that are part of a blog post. Link Properties include many attributes such as title, synopsis, and URL. In addition to these basic attributes, optional MIME type and size can be added for rich media files that your post may reference, such as a podcast or video file.

The optional attributes are used to display files such as podcasts that can be played from the blog display, or downloaded in the weblog's RSS or Atom feed.

Syndication OptionsRSS (Rich Site Summary) Feed Atom Feed OPML (Outline Processor Language) Feed MYST-ML (MyST Markup Language) Content Feed MS-Office Smart Tag Subscription