In case you aren't already using Turnitin.com, I wanted to let you know that we have a school account available to you. I am our site administrator, and I can set you up with a login. Just let me know if want one. Turnitin is a tool you can use to have students submit papers and have them checked for plagiarism, complete your grading and comments online, and set up peer tutoring.
Turnitin provides a lot of help and tutorial information, as well as online professional development sessions. Check this link for some current professional development offerings on "Offering Meaningful Feedback with GradeMark Comments" and "Faster Easier Grading with GradeMark Rubrics." There is also information on that page about using Turnitin with an iPad. Let me know if I can help with anything.