Funny you should ask about these things. I was working on prototype.php.net site a lot about a year ago, but then got caught up with my work.
Things I believe should be finished before launch: 1. The documentation pages need to be full-page width. They are far too narrow in their current state. They also need more gutter room. 2. Kill the Quick TOC in the documentation. This frees up a lot of space, but means we need to find a new home for the language switcher and how to report an error. 3. Replace the mega drop-down navigation with simple links that lead to landing pages. The landing pages are more effective at what they do than the drop-down menu. Look at the community portion: it would change every time the news changed. That doesn't sound like a good primary navigation idea to me, but would be a great landing page.
