The link created to show what comments have been posted uses a title attribute, but the content needs to be 'cleaned'.
Basically the problem arose when an author on my site used double-quotes in the post title. This caused the title attrib to bork.
<a href="http://blog.carbon-360.com/.../#comments" title="Comment on FT: " carbon="" trade="" on="" trial="">1 Comment »</a>
for the post named
Comment on FT: "Carbon Trade On Trial"