Brandon Savage has posted a list of blogs he suggests following for those interested in the PHP community including (disclaimer) PHPDeveloper.org itself.
A lot of people, especially when starting out in PHP, ask me "what blogs should I read?" There are a lot of great PHP blogs (you can see a nearly complete list of them at Planet PHP) but there are a few that I read on a regular basis and I feel are important.
His list includes PHP community members like Matthew Weier O'Phinney, Chris Hartjes, Anthony Ferrara and the PHPMaster.com site from SitePoint. Check out the full list for more great blogs.