What is that agile certification really worth?

Agile has revolutionized how software development and project management get done, increasing demand for IT professionals versed in the methodology and its many flavors. To help vet candidates and give IT pros an opportunity to stand out, a number of agile certifications have arisen, each offering a unique approach to benchmarking IT professionals' knowledge and competency with the framework.But do certifications, especially with a methodology like agile, truly prove competence and proficiency?