Starting today you can now verify the Salesforce.com Certification Credentials of Salesforce.com Professionals. Just navigate to the URL http://certification.salesforce.com/verification enter the full name or email address of the person and click Search.

Salesforce.com Certification Verification

Click on View Certifications and there you go

Ashish Agarwal Salesforce.com Certifications

For this to work, the Salesforce.com Professional whose credentials you want to verify must opt-in for the Verification in his or her Webassessor profile.