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One of the greatest sources of frustration in PHP is the disconnect between the documentation and the actual C source code. I personally keep a copy of the PHP C source code handy for searching purposes but I know I'm in the minority and, even then, I rarely crack it open because doing so requires overcoming certain mental inertia. I also have observed a general disdain of PHP userland developers on the internals list because userland devs don't look at/understand the C source code.
Let's try to fix this. If each page of the documentation linked back to the relevant C source code (e.g. via an online git viewer), userland devs might actually click those links and learn how PHP works behind the scenes. It that happens, it has great potential to both massively boost the number of people working on the core and dramatically reduce the amount of noise on bugs.php.net. At the very least, it would raise awareness of how each built-in function, method, and class actually works, which is better than people *guessing* as to how they work in comments and forums across the Internet and on php.net itself. Nothing is more frustrating than to see someone incorrectly guess how a software product works when the source code to that product is readily available.
I realize linking back to the C source code from the documentation is a fairly involved task. A new documentation section would have to be standardized upon, every page of the XML source would have to be updated to add the section, and then every change verified. Keeping the links in sync with the main source code could be a challenge as well. It might also require tagging the core with some sort of common format, which would, of course, cause no small upheaval on the internals list.
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FWIW, there's <http://lxr.php.net/> which allows for code browsing
of the PHP sources.