[wp-hackers] Linking stylesheet to RSS feeds

[RePost]

Notice on this WordPress feed that the images are treated as "media 
files" and not appearing in the copy:
http://www2.macleans.ca/category/arts-culture/feed/

This avoids the problem of images bumping into the text.

I have no idea how they attached their logo in the upper right corner 
(thought you needed FeedBurner for that). But that's beside the point.

How do you induce WP to treat your images as media files?