Don't allow commenting if not logged in.

Gamespot, please save the comment to cookies or something when you try to post a comment, but are not logged in.

I can't count how many times I have tried to reply to somebody, only to realize that when I post, it leads me to the Log In screen and deletes my comment.

I have seen other sites that save the comment, so that after you're logged in, it redirects you back to your saved comment.

--

Or simple, don't allow commenting, if not logged in.