Do you still need to convince your boss that PHP is a mainstream, widely-used, here-to-stay web technology?
I hope not, but if you’re in that unfortunate position please send him/her over to Dreamlab.ca who’ve put together a lengthy list of the organisations depending on PHP, I’m sure there’s a few on there you didn’t know about.
I’m also working on Zend to output their PHP jobs alerts as an RSS feed, with any luck you’ll be seeing that soon at PHPkitchen.