This is a really great list (well, maybe not link previews, but everything else). Sidenotes in particular are something I want to see basically everywhere, not

This is a really great list (well, maybe not link previews, but everything else). Sidenotes in particular are something I want to see basically everywhere, not just blogs. Modern screens have tons of horizontal space, text is most readable in pretty fairly narrow columns anyway, and scrolling to the bottom just to read a footnote (or, worse, having it pop up in some janky pop-over) is really unpleasant. Happy to see them catch on the blog world at least.