"The Secret to a Successful Job Interview," Robin Wagner, Chronicle of Higher Education (2000)
Boston Consulting Group
Multiple practice cases, interactive case, additional interview questions, great interview tips.
McKinsey & Company
Two practice cases, good interviewing tips.
Capital One
Good guide through the case interview process, practice cases, links to test-taking prep resources and thinking skill enhancers.
Wet Feet
Helpful general info on all aspects of interviewing, including case.
Vault Guide to the Case Interview, Mark Asher et al. (Vault, Inc., 2002)
Management Consulting: A Complete Guide to the Industry, Sugata Biswas and Daryl Twitchell (John Wiley & Sons, 2002)
Case in Point: Case Interview Preparation, 4th Edition, Marc P. Cosentino (Burgee Press, 2005)
The Harvard Business Guide to Careers in Management Consulting, Maggie Lu, ed. (Harvard Business School Press, 1999)
Vault Case Interview Practice Guide, Rajit Malhotra et al. (Vault, Inc., 2002)
Crack the Case: How to Conquer Your Case Interviews, David Ohrvall (Turtle Hare Media, 2005)