That footnote plugin looks nice. Check the entire list.
Plenty of previously unknown plugins (to me).
An opinion regarding the Core plugins matter from the enterprise perspective.
Matt Mullenweg’s excellent reply on an article criticizing the plan for canonical plugin:
Now if in the course of working on these three plugins it looks like we’re going to cause the end of WordPress as we know it, we’ll change course. It’s not that big a deal, and we’ll figure something else out. The only dangerous course of action is doing nothing at all.