Excellent, timely, well-researched, and highly recommended for both content and pedagogical quality. I came across this tutorial last year while reviewing lessons on evolution, especially lessons that address "evidence" as has now (again) come to the fore in teaching about evolution in public K-12 school context. The sequence of whale evolution is the new favorite textbook example, partyl because it includes such fascinating and fun examples of intermediary (which, by the way, certain anti-science interests had previously touted the lack of). I WISH I were currently able to try this lesson out with kids, but as a former science teacher I am confident it is a good lesson.
Suggest to secondary-level teachers to prepare by reading up a little on latest findings/research on whale evolution and/or have kids do some up-to-date research. Also, check up on the current state of the creation/evolution "controversy" and any legal battles in your area. Having kids critically examine the "evidence against evolution" (IE creationist criticisms) might be an intersting exercise if the teacher feels confident enough to separate rigorous science from pseudo-science and to separate relgious indoctrination from science education.