Just a quick note that several updated versions of Moodle are now available: 2.2.2, 2.1.5, 2.0.8 and 1.9.17. The oldest of the two updates are only now receiving security fixes. Check out the full post here: http://moodle.org/mod/forum/discuss.php?d=198070.
The latest and greatest 2.2.2 received a few minor enhancements (including a functional adaptive quiz mode) and many bug/security fixes. For more information visit http://docs.moodle.org/dev/Moodle_2.2.2_release_notes.