What are the most valuable certification available for Programming?
Most valuable thing for a developer: being able to show you can convert requirements into working and maintainable software.
Certifications generally are worth very little, except in a few niches that demand them (or at least ask, until they give up and get someone who puts practice before pieces of paper).
I would like to know what are the certificates available for programming, like 

Zend for PHP
SUN Certification for java

What are the others? Javascript? C++? Python? etc...
Please give me some suggestion for other available certifications.