As it is written on the site: "the Teaching Perspectives Inventory can help you collect your thoughts and summarize your ideas about teaching. It can be useful in examining your own teaching as well as helping clarify the teaching views of other people."
I think that we need a little bit of theory. Marc Prensky with his concept of digital natives and digital immigrants is very inspiring and sometimes helpful when we have to understand our students.
Very useful application when you need to do the survey, even test your students. There are some limits on free account but not so devastating as lack of space on edublogs.