I am sitting here enjoying the Olympics (long track is my favorite) and figuring out new things for the classroom/grading student assignments.
One thing that has been missing from Chromebooks has been a way to make screencasts. Enter Screencastify! While you still cannot record just a portion of the screen, it is huge step. It also works on Chrome. You can either download it onto your laptop or put upload it straight onto YouTube.
By the way Chromebooks are a great way for your school to get a sub $300 laptop for your students and works well if you are comfortable on the cloud. I like them so much that we have two here at home for my kids.