This is based on Reddit web 2.0 but even more pretty which in turn is based on Reddit Web 2.0, but pretty.
The main differences: more obvious "points" count in threaded discussions to draw attention to high count comments while also allowing you to easily weed out comments with low counts.
And larger [-] to more easily collapse entire sub-threads.

( The "before" pic below uses Reddit Web 2.0, but pretty. to illustrate the primary differences )