If you're a fan of Planet-PHP (our fellow PHP news source) and have wanted to see how things run behind the scenes, you might want to check out this bit of information from Christian Stocker on where the source has ended up.
After Lukas asked me for the current Planet sources, I realized that I didn't really maintain the sources in the mentioned SVN repository anymore (for various reasons). So I decided to finally move them to GitHub. It makes much more sense there, since the most decent thing to do if you want to set up your own planet is to fork it and git (plus GitHub) makes that painlessly easy. Nevertheless I'm of course still interested in patches.
He warns that the code is a bit on the old side and that the framework its based on has officially been deprecated. If you're still interested, though, you can find (and clone) the application from its GitHub page.