Overview on writing a critical review of a book or article: this clean little page offers a nice overview of review writing and a number of useful links.
How to Write a Critical Book Review: advice and questions to ask when writing a critical book review.
Some General Criteria for Evaluating Texts: this chart from UNSW Sydney lists possible questions to ask when evaluating certain criteria in a text.
Overview of writing critiques: a concise guide that describes different types of critiques and strategies for critiquing.
Helpful Hints for Writing A Critique: an explanation of general guidelines and the structure of a critique by the Academic Support Center at Chesapeake College.