This is PubSubHubbub publisher plugin for Movable Type 4 or later.

You need to configure Hub URL(s) in your per-blog preference page, and then insert

    <$mt:PubSubHubbubLinks$>

in your 'Feed - Recent Entries' (atom.xml) template, probably after '<link rel="self".../>'.

Copyright Six Apart, 2009
This plugin is written by Tatsuhiko Miyagawa and licensed under the Artistic license and GPL v2.