Dr. Kathie Nunley's Layered Curriculum Web Site for Educators
This site presents an attractive way to manage a classroom offering multiple options for students to learn the content via their own path. Units are set up with required and optional activities such that all students must attempt C level work, but there are additional options for B and A level work. Also, within the levels, there are opportunities to attain the grade in several different ways.
Besides all of the background information, there is a rich library of sample units that can be downloaded and adapted. Most units contain technology applications and/or web resources.