Survey responses from math grad students to the question
"Knowing everything that you know now, what advice would you give others
entering or in the early years of graduate school?" (phd-survey.org)
Richard Landers,
NeoAcademic blog -
"technology, education and training research from an industrial/organizational (I/O) psychologist in the ivory tower"; includes helpful posts such as
"Grad School: What Will My First Year Be Like?"