Another subtle feature addition: a flame-war detector. Graham has been consistently deploying and updating proprietary software that determines whether there is a flame war, where people argue heatedly. When these flame wars take place (which Graham says can often get ugly and personal), the story in which the commenting is taking place is moved further down the page.
Remember the above the next time someone claims that a rogue contingent must be flagging stories on a particular topic because it is further down the page than other stories submitted at a similar time and with a similar number of points.