The author (Audrey Watters) is a truly great journalist, and her work provides a candid — and harsh, if needed — look at the education world. She's a must-read for anyone working in edtech.

EDIT: I found her work on the incestuous world of edtech funding and media (e.g., EdSurge) to be especially illuminating. Because she is not an edtech founder, she was able to point out these relationships/issues without worrying that she was going to anger VCs on whom she might someday seek funding.