Usefull sites for Certification Exam...

http://sudheer4sfdc.blogspot.in/

http://salesforcedumps.blogspot.in/2012_01_01_archive.html

http://shivasoft.in/quiz/index.php

http://www.allaboutsfdc.com/

http://salesforcesfdc.blogspot.in/2012/01/dev-401-sample-question-and-answers_18.html

http://my.safaribooksonline.com/book/-/9781849683487/exam-guide-and-practice-paper/225

http://allaboutsalesforce.blogspot.in/2012/01/dev-401-certification-mock-exam-2.html

http://www.youtube.com/watch?v=ae_DKNwK_ms&fmt=22

http://www.salesforce.com/cloudcomputing/

http://www.salesforce.com/smallbusinesscenter/faq/

http://www.salesforce.com/customer-resources/releases/

http://www.salesforce.com/customer-resources/learning-center/#before-you-start

https://salesforce.adobeconnect.com/_a13852757/spring12forcedotcom/

http://www.salesforce.com/services-training/training_certification/online/(CRM)

http://niketc.blogspot.in/p/get-started-for-sfdc-401.html

https://help.salesforce.com/apex/hthome\SA5

http://www.proprofs.com/quiz-school/story.php?title=winter-11-401-exam_1