User blog comment:ShermanTheMythran/Introducing... Lia!/@comment-5340211-20121120001326/@comment-3444778-20121120005317

Every other parent comment switches sides. Replies are indents of their parent comment, on the same side. The catch is that reply comments that are replies to a parent comment aligned to the right all get indented from the right. It was a bit confusing to code.