I haven't done one these for awhile...a Moodle release announcement. Last year, we took Moodle off our Top 30 CMS Focus list so it isn't on my radar too often. But like so many great content applications out there, just because it isn't on our list doesn't mean you shouldn't still consider them for your CMS.
Below is almost a straight copy and paste from the release announcement at Moodle.org. Be sure to also pay attention to the release notes for additional details. And yes, as a non-Moodle user I too was confused as why there are four different versions of Moodle being supported and updated. The explanation is at the end of the announcement.
Moodle 2.2.2, Moodle 2.1.5, Moodle 2.0.8 and Moodle 1.9.17 have been released.
In addition to a number of bug fixes and small improvements, security vulnerabilities have been discovered and fixed. As always, Moodle recommends that you upgrade your sites to these latest versions as soon as possible. All admins of registered Moodle sites have been notified with security issue details.
Upgrading should be very straightforward. Full details about the releases can be found in the release notes:
The releases themselves are available via the Moodle download page as packages or direct from our CVS and Git repositories.
Please note that Moodle 2.0.8 and Moodle 1.9.17 are no longer fully supported. They are supported for security fixes only.
Bryan Ruby is the owner and editor for CMS Report. He founded CMSReport.com in 2006 on the belief that information technologists, website owners, and web developers desired visiting sites where they could learn about content management systems without the sales pitch. Besides this site, you can follow Bryan at Google+ and Twitter.