The link to add a new comment is at the bottom of the list, but new comments show up at the top of the list.
This is confusing, especially when the list of comments is long enough to be taller than the visible page.
I just made the same comment three times on one story (and of course, there's no option to delete a comment) because I thought I'd hit cancel instead of post when I didn't either see my comment or see a refresh link.