OEDb (Open Education Database): The Grad Student's Guide to Applications and Admissions. Provides a timetable for deadlines on when to take tests, contact letter writers, contact programs, and more, information on the Admissions Process, and preparation for applications.
Top Grad School Guide 2013 - A free online guide including application information, scholarship information, interviews with students from various programs, country reports for studying abroad, and more.
Graduate School Application: Tips, Advice, and Warnings - Cliff Notes collection of different Graduate School articles to assist in preparation.