I've just put up a framework independent PHP library for PubSubHubbub subscribers:
http://github.com/lxbarth/PuSHSubscriber I've developed it during my yet-to-be released PuSH integration for Drupal's "Feeds" aggregation framework and I tested it against superfeedr.com and pubsubhubbub.appspot.com. Feedback, patches, comments welcome! Alex
