For the Drupalistas in the community, here's my blog post on today's release of PubSubHubbub support for Drupal via the Feeds module:
http://developmentseed.org/blog/2010/feb/23/pubsubhubbub-support-drupal (as posted earlier here, PubSubHubbub support is based on the PuSHSubscriber library http://github.com/lxbarth/PuSHSubscriber). Cheers - Alex -- http://twitter.com/lxbarth
