PonyFilter: Keyboard navigation for comments, similar to what's demonstrated here, except the pagination hack wouldn't be necessary (unless you wanted it to go to the next thread instead of the next page). 'j' would go one comment down the page and 'k' would go one comment up the page. It'd be a real nice addition!
While this guy does need the "slap in the face" back-to-reality technique he's getting, he doesn't need it to the extent he's getting, and the extent of name-calling is more likely to make him re-entrench in his behaviors than it is to assist in the change of attitude he's seeking. This comment is particularly unhelpful.
There is a single page that globally ranks comments across the three sites by number of times favorited, spanning the past seven days (link). There are individual pages that rank posts for each subsite by number of times favorited in the past day (AskMefi, Mefi, and Meta). Do there exist individual pages for each subsite that rank the comments most favorited within the past 24 hours — or even a single page that spans all three but ranks the most favorited comments in the last 24 hours?