To justify this thread it needs to be in the right context so I think it should be left alone.
But seriously, I could see a place for it if the text block is more of an element in the design than an actual text block. But my wife who's real designer keeps telling me, if the text is to be read there's no place for justified text - or something like that.
EDIT: I'm not a real designer, just one of those wooden ones.
That's funny I was just deciding on if I should justify text in a book I'm designing this morning. I think there is a place for it but it really depends on the line length and what it adds to the design. I'm on the fence on this one.