Here's an example where the clipped RSS feed really reduces my usability. I use FeedOnFeeds, and the below is a recent entry I have in it for the OK/Cancel weblog/comic strip.

There is no reason why this can't have the actual comic strip in it. I subscribe to a number of comic strips via their RSS feeds at Tapestry. All OK/Cancel has to do is add in the image tag for that strip, and it will automatically show up in people's aggregators - even offline ones. I really wish they had the full feed in their weblog posts, and then the actual comics in the feed. That would radically increase the usefulness of the OK/Cancel RSS for me.