For accountants, it is essential to become a Certified Professional Accountant (CPA) or an Enrolled Agent (EA) to differentiate us from our competitors.  But I've also aquired the following certifications that sets me apart from other accountants:

CGMA:  Certified Global Management Accountant

CITP:  Certified IT Professional

PMP:  Project Management Professional

We also have several Quickbooks certifications along with other software certifications.