Front Page Featured Comment
It would be neat if there was a box on the front page with a single Featured Comment, or part of a comment. The folks who have the ability to Feature an Instructable could be given the ability to also Feature a comment.
It could lead folks to the Instructable, or even the Commenter.
In the SFGate box it looks like they just choose the featured comment editorially. I'm not sure how often it changes. I think just whenever they decide to change it. I've never seen one persist for more than one day. It doesn't change with reloads; that's why I think it is chosen editorially.
I love a lot of my comments.