I've updated the BJ Pie Filter to work with the new BJ layout.
Update 1: it is now up-to-date as of 5:00pm Monday (March 25, 2012-ish). Things are still under construction over there, so don't be surprised if it stops working again. BJ is a moving target right now.
Update 2: Updated as of Saturday 3/31/2012 6:00PM.
Update 3: Updated as of Saturday 2/16/2013 6:00PM.
To use this, you’ll need Greasemonkey:
I'm not sure if other browsers have GM support or not. Consult your local geek.
You can download the pie filter, here.
Then, whenever you load a BJ article page, you will see two buttons below the comment text box: "Add Selected" and "Remove Selected". To filter a user, select the text of the user's name, and click "Add Selected". From then on, comments from that user, and any other user you've added, will be pie'd. To remove a user from your list of filtered users, select the user's name and click "Remove Selected".