Somewhat tangental, it would be great to be able to sort that list by average karma. There's a lot of users in that top 100 that got there via quantity of comments alone, it'd be interesting to see who the most _valuable_ contributors are rather than just the most prolific.

Execute this in the page's scope. Works on Chrome at least.

    (function(){
      var table = document.querySelector("table tbody tr+tr+tr td table tbody");
      [].slice.call(table.querySelectorAll("tr")).map(function(r){var c=r.querySelector("td:last-child");return [c?parseFloat(c.innerHTML):0,r]}).sort(function(a,b){return b[0]-a[0]}).forEach(function(r){table.appendChild(r[1])});
    }());

Points are a pretty bad approximation of 'value' though. My shortest and most mundane comments are always the ones that get the most upvotes, meanwhile my lengthier ones that actually lead to insightful discussions hardly get any. And I've seen that same complaint around here from other users for a while now. The only real 'solution' I could think of would be to use slashdot's odd voting system, but meh...