True enough @ahundiak; even if one doesn't know how to code in C there are plenty of opportunities http://www.php.net/get-involved.php
Contributing to PHP
Anybody who programs in PHP can be a contributing member of the community that develops and deploys it; the task of deploying PHP, documentation and associated websites is a never ending one. With every release, or release candidate comes a wave of work, which takes a lot of organization and co-ordination.
With the introduction of release managers comes a smoother release process, but help is still needed: testing release candidates, finding and squashing bugs in tests, documentation, and sources.
Four Best Ways to Contribute
Running test suites in RC and release distributions of PHP
Help finding and diagnosing failed tests, see the phpt documentation
Filing and resolving bug reports at bugs.php.net
Help maintain and or translate documentation files at edit.php.net
Development of the PHP source
Someone hoping to become involved in the maintenance and development of the source should be experienced in all of the areas mentioned above, as this creates a strong team; everyone knows how every other part of the project works.
You will also need experience in C programming as PHP is written entirely in C.