Several users have recently demanded the availability of publicly accessible OPML outlines of their digests' sources for a while now. While OPML has been available in Feed Digest for months, it's been accessible to logged in users only. Now it's available to access from anywhere. The URLs aren't guessable, so as long as you keep your URL for your own use only, you're good to go. To get the URLs, log in to your Feed Digest control panel and there's an OPML link alongside each digest.