Here’s a presentation which highlights the use of Groups and Groupings in Moodle and how the LMS can be used to support differentiated learning for students in the classroom/online courses. The presentation was created by John Dawson of Champlain Vally Union High School (in my home state of Vermont!). Check out their Moodle here: http://learn.cvuhs.org/.
Enjoy the presentation (direct link to the presentation on Prezi: http://prezi.com/iniwp_m0cari/differentiation-using-moodle/