Excel is a valuable productivity tool especially with the switch in teaching paradigms. Teaching used to be considered an art, but more and more it is becoming a science. Every instructional decision has to be backed up with data and Excel is a really nice way of managing numerical data.
The Excel assignment was a nice practice assignment for me, but not a real challenge. My AP sends me excel assignments to do for him all the time so the functions that we were using are something that I have a lot of experience with. We have a large database that contains all of the testing data for students in our county. This database allows us to query various reports and import the data into Excel for further adjustments. I use the conditional sort a lot.
I don't usually have multiple pages so it was neat to learn about the dynamic page changing. I could see that being really useful if something on each page needs changed like a header. I found the ExtraCredit option particularly interesting because I don't get into the statistical functions very often. I could see that as a nice quick and dirty check to evaluate correlations. I liked the context of checking the success of a test in comparison to the success of a homework assignment. That is a nice way to see which homework assigments may need tweeking to be more useful to the students.