I recently discovered this video online that explains Wegener's Granulomatosis and microscopic polyangiitis. In very easy to understand language, with very little medical jargon, it provides a brief overview of the disease including the symptoms and treatment of the disease. It it one of 10 videos exploring vasculitis and related diseases.
The video has been produced by the Khan Academy, a not for profit organisation providing free education resources for students, parents and teachers.
I think that this video would be a great introduction to Wegener's Granulomatosis for those new to the disease.