Is it just me, but if you are reading a discussion ( on webmasterworld.com), having the Post New and Reply on this screen, can lead to a tendancy, to Post a new Topic accidentally, when what you actually mean to do is reply.
As a suggestion, the Post New button should not be on the read discussion detail. Only Reply should be.
I did this once as a newbie, and noticed right away because the post new topic page is different from the post reply. I knew something was fishy when I could enter a title / description for what I thought was a reply.
Maybe as a solution, the two could be more separated, or different colors.