Compacting & Differentiation in Content Areas

Chapter 4 gives great strategies about compacting curriculum & differentiation. I think both of these buzz words are going around right now. My question for you is do you personally use any compacting or differentiation in your current classroom and can you give us examples of what they are and how you use them?

Allowing Students to Learn at a Faster Pace

The author makes the statement "gifted students should be allowed to move through it at a faster pace than the rest of the class." Do you believe this to be true for most highly intelligent & gifted students? If so, what percentage of students do you believe are allowed the opportunity to learn at their own pace and continue learning in America? And what do you feel about this?