screencasts with solutions of typical interview tasks https://www.youtube.com/user/ProgrammingInterview/
Gayle Laakmann McDowell. Cracking the Coding Interview: 150 Programming Questions and Solutions http://www.amazon.com/Cracking-Coding-Interview-Programming-Questions/dp/098478280X
140 Google Interview Questions http://www.impactinterview.com/2009/10/140-google-interview-questions/