PHP for the rest of us
Those of us in the web development business are more than familiar with PHP. In fact, most of us are crazy about it (except for those of us stuck using ASP).
But maybe you haven't used it yet because you aren't a programmer. Even if that's the case, there is still plenty of PHP that you could be using. If you do any sort of web design and would be willing to learn to use a single PHP function, make it include().