Ask HN: How do you like your RSS feed?

For some years I serve a feed.rss with excerpts (title, intro, date and url) from my blog (willem.com/blog). I noticed that traffic has increased significantly on the feeds.

I want to improve the experience, how do you like your feeds best? Complete with images? Any examples of websites you really enjoy (via rss?)

For those with eReaders, I also consider adding ePub and PDF support. I just want to facilitate the reader and reading - don't care about keeping traffic on my own webserver.

Thank you for chiming in!