Interesting developments @ http://slashdot.org today:
Slashdot Code Update
You will likely notice a variety of changes in the comments system if you are logged in. Most of these changes surround the new 'Zoo' system which implements (among other things) a sort of killfile function, and much more. Logged in users have the ability to flag each other as Friends or Foes, and assign bonuses and penalties appropriately. So if a user annoys you, you can easily not read their comments any more. If you notice any bugs, feel free to submit them or let krow or me know.
Is this on a to-do list, or would this be up to someone to write a hack?