The Ultimate Guide to Programming Interviews
http://www.programminginterview.com
The Ultimate Guide to Programming Interviews was created during my job hunting days. During this time, I saved all the review material and content that I had gathered in preparation for the interviews to help me study, and figured others would also benefit from this information.
As a result, it's a very thorough compilation of the essentials for technical / programming interviews. There's practice questions that include answers with detailed explanations, and I also cover important non-technical aspects including how to deal with HR questions and salary negotiations.
The site is in Drupal and works fantastically. The flexibility of the modules along with the book content format made the construction of this site a breeze, and a free professional theme was just icing on the cake.