GetDegrees.com is a good starting point when researching online education options. It combines an extensive database of distance education programs with well-edited articles about career development, and user rankings and reviews of online colleges.
Branching off their well-known annual ranking of colleges, U.S. News & World Report offers a guide to online education that contains useful background information on the subject as well as a directory of graduate degree programs.
Once you have identified your top picks for an online degree, this website may help you refine your final choice and avoid potential pitfalls. OnlineDegreeReviews.org contains thousands of student reviews for hundreds of online colleges and degrees.