The Common Core at your fingertips!
I think this app is a must for teachers. They did recently add a notes area. I think in order of this to be exceptional, the notes area needs to be attached to Ever Note or Google Docs.
How I Use It
This should be a must app for teachers and administrators. This app puts the entire CCSS document at your fingertips. You can search for the specific standard within ELA/Math and each subject area.