A DiggBar Blocker
OBSOLETE: According to the community you should use the http://www.drupalproject.org/project/diggbar_blocker or http://www.drupalproject.org/project/frameprevention instead.
An implementation of the Diggbar Blocker for Drupal, written by Dustin Brewer. Original idea/regex/message by John Gruber, http://www.daringfireball.net/2009/04/how_to_block_the_diggbar
By default this module will show John Gruber's message:
Dear Digg, Framing sites is bullshit. Your pal, --J.G.
NOTE: This module will not work with Drupal's Aggressive Cache setting.
Most updated source on github: http://www.github.com/mannkind/diggbar-drupal-module