Bloglines support podcasts

Looks like Bloglines is supporting enclosures/podcasts now. Very cool :-) Here's a screenshot of The Daily Source Code - notice the "Enclosure" link The "Enclosure" link pulls the media file from the link in the item's enclosure object. I was expecting Bloglines to pull down the file and serve it from their boxes. Wonder if they'll do that in the future? The doc also says:
Plus you can save podcasts to your Clippings folder, or post them to your Clip Blog to share with others.
This appears to do the same thing - the actual media file is not captured. What happens when it is no longer available on the host server?