Peterson's: Search for Ph.D. programs - How to search for, determine the best locations, cost, and opportunities for Ph.D. degrees.
Online:
Idealist: What's the difference between a masters and doctoral degree? Descriptions, comparative charts, how to decide, and examples of how each are utilized professionally.
OEDb (Open Education Database): Master's vs Ph.D. Degrees for Graduate Students: Lisitng of careers in order of those requiring a Master's degree and those requiring a Ph.D. degree, in addition to information on salaries and research.
GradSchools.com: Master's or Ph.D.: Which is Right for You? Analysis of time, money, commitment, and weighing your options.
AllAboutGradSchool.com: Master's or Doctorate? Information about both options, links to business/engineering/medical/law schools, financial aid, and studying abroad in addition to preparation for tests including the GRE, GMAT, LSAT, MCAT, and TOEFL.
PhDs.org: "The top Ph.D. and Master's Resource on the Web." - Directory of programs and rankings by subject area. Complete with an education index, interviews of peers in Master's and Ph.D. programs, and job postings for Ph.D. and Master's graduates.
Reading:
Demystifying Post-Graduate Research: from MA to Ph.D. (2001)
