if you are going to work in web based application using Java, PHP, ASP.., or want to become a DBA, or Consultant it would be helpful to have Certified MySQL Developer (CMDEV) certification as I have seen there are few people who are MySQL Certified, but from my point of view its good to have the certificate, at least it will give you the idea of what are inside of this popular open source database system. for finding job in the IT market it works as charm specially if you want to work in MySQL based database systems.

Thanks