It basically lets you copy and paste marked text (or pictures or tables) and automatically adds the corresponding source information with a single click. Makes a task like this a cakewalk. You can then even publish your compilation of notes if you want to (copyright concerns apply of course)
There is a Firefox extension available (i am not sure about IE) that makes keeping your notes in order even easier. See the little pop-up on the right-hand corner?
Like for many Google services, you need to be logged into your Google acount, if you need an invite, just ask me and i'll provide you with one.
