These are two options that have been brought to my attention recently.
Mastering Series by Paul Aubin
Paul has been running some online web training this summer and is currently conducting one focused on making Revit families with the family editor. He has increased the number of participants so he can accept many more students now. For more details you can visit his website.
BIM Tutorials - Virtual Tutor Revit Families
I received an email last week (as some of you may have as well) from this organization that has just created a DVD of tutorials focused on the family editor as well.