Twenty Eleven Post Formats – What Are They and Why Should I Care? A great post explaining what the available post types are and what they do in the Twenty Eleven theme (which is the ‘parent’ of this site’s theme).
In this theme, I’ve tweaked the ‘link’ type behaviour after I surprisingly found out that the ephemera widget takes the first link in ‘link’ types. It seems to favour single links-per-posts only, and I tend to get a little wordy (like this ‘link’ post.)