Ruby library that handles section 7.1 only of pubsubhubbub (notifying hubs about new content).
http://pubsubhubbub.googlecode.com/svn/trunk/pubsubhubbub-core-0.3.html#anchor9
require 'push-notify'
PushNotify::Content.new(
'http://mycontent.com/atom.xml',
'http://myothercontent.com/rss.xml').tell(
'http://somehub.com/publish',
'http://someotherhub.com/publish')
PushNotify::Content.new('http://mycontent.com/atom.xml').tell(
'http://somehub.com/publish') do |resp|
puts resp
end