My current position this year, among lots of other things, is to help teachers differentiate activities/lessons, etc. in their classrooms. There is a ton of research out there on this and people have written numerous books on the topic. My favorite authors on the subject are Carol Tomlinson, Beverly Tyner, Sharon Walpole, and Michael McKenna.
This week, at my school, there has been a push for teachers to show on paper how they are differentiating each subject in their classroom. I've found a few links to share with them. Hopefully this is the start of a long list. Does anyone have others to share?
From Wilmette public schools, this site provides printable pdfs and presentations for teachers as well as ideas and examples.
Great examples per grade level and subject of differentiation by readiness, interest, and learning styles.
Links to all things differentiation.