Katie, I enjoyed looking through this STAIR. I can definitely see it being a useful resource for students just getting started. The STAIR has a fresh look and is easy to navigate. I like the progression of activities and teaching tools--video, quiz, examples, have students try it out, etc..
The video was very cute, but I wonder if middle grade students would find it a bit elementary - with the panda and younger students giving the information.
Great resource. I'll have to have my students blog so I can use it!