Gmail in the classroom

I have been using Gmail in my classroom by having students create google docs and sharing those google docs with me.  When I have access to the students google docs, it allows me to edit their papers.  I like this tool because I can make comments right onto their paper without making the correction myself.
It is also nice because when a student shares their document with me it comes right to me in the form of an email.  I set up a folder within Gmail to put all of my student writings in.