VMware created a special exam for those wanting to recertify their VCP5-DCV - a delta exam for those who have passed the vSphere 5.0/5.1 exam - the code is VCP550D.
It's only available for a limited time, you can take it from any location, it's a lower cost than a regular VCP exam too.
Find out more here: VMware Education and Certification blog
You can download the exam blueprint and request exam authorisation here: VCP5-DCV Delta Recertification Exam page
Some quick tips:
1. Only request authorisation when you're ready to take the exam as you only get 48 hours from authorisation time to take the exam itself.
2. Focus on the 5.5-specific elements of the blueprint.
Update: The VCP550D exam was originally only available til November 30th 2014, but it has now been made available til March 10th 2015 which gives all VCP5-DCV holders the chance to recertify.