Hub.Moodle.org has been the official Moodle hub for published and shared courses. It now has a new URL: Moodle.net. This is still the same great resource but now with a simpler/shorter URL to type in. Any previously shared courses and viewable courses are still accessible and future connections to the site formerly known as the MOOCH will go to the right place automatically.
Read more FAQs about Moodle.net at http://docs.moodle.org/24/en/Moodle.net_FAQ