I saw this today on the 37 signals blog and thought it was good use of design to combat troll comments.
There must be some facility on their blog to flag up troll comments. Instead of reacting with more comments, which is what they want, design is used to cleverly to highlight and make the commenter look like a bit of a fool.
I like the way the text is greyed out subtly showing the comment is not as important as others around it. Also adding a troll dunce hat is genius, it makes the guy look silly and the best thing is he can do absolutely nothing about it.
I wonder if this kind of technique actually discourages troll behaviour?