Get the best  Facebook apps. Calendar from 30 Boxes will help you organize your semester, compose to-do lists for all your courses, and invite friends to upcoming events like the cram-before-the-midterm study group. Divshare will allow you to share your class notes, reading outlines, and research materials (as well as photos, music, and videos) with classmates. And Classes 2.0 will let you post your class schedule on your Facebook page...

http://www.usnews.com/blogs/professors-guide/2009/1/7/10-back-to-school-bargains-for-college-students.html