When replying to a comment in a thread (the parent being a comment, as opposed to a comment like this, where the parent is the article) it would be neat to have the article link available above the reply box (as in the article-parent case).
Several times in the past week I have clicked on a thread, read the thread for comments, clicked the article link to read, clicked back, and then hit "reply" on a comment. Half way through formulating a comment I think "oh, I wonder if the article touched on $foo" and then have to either unwind the stack or open a new tab to news.yc and retrace my steps. Being able to control-click from the comment page would be ++handy.
