The RSS and google reader is hard to navigate. I had some trouble getting some of the sites into my subscription list. I read a couple of other blogs and new feeds but I couldn't figure out how to make them appear. After I subscribed it was a little easier. Finally my friend discovered that you can type what you wanted in the search field and this moved the process along quicker. I have add some social blogs that I follow as well as science and math instructions blogs.
It may shorten time you would normally be navigating on the web to see items you read frequently. I am not sure of how I would use this in my classroom on any type of regular basis with the students.
The administrations might be able to use this for sending out information that would be assessable from anywhere even when email is not.