A big congratulations!
We had another programmer today here at Customer Paradigm successfully pass the Magento Certified Developer program.
The Magento developer test was designed as a way to ensure that the programmer working on a Magento site has studied, understands the Magento framework, and really understands the platform inside and out. It can take 6-12 months to prepare for this test and study, and the test covers all aspects of the Magento core platform, including the Community and Enterprise systems.