What I think is interesting about /. is the moderation system: comments can have a score of -1 to 5, and users can set filters similarly so they'll only see posts of at least the score they set.
Moderators are temporarily randomly assigned- readers find themselves with five "Mod Points" one day, and they have three days to use them- to kick any five posts up or down one level. It takes multiple moderators to do multiple points on one post.
What amuses me is that posts of my normal quality are consistently getting kicked up- "Insightful, Interesting, Funny." More than the average.
It really helps one's self-esteem to have that happen, y'know?