A little bit back Akash Mehta posted a list of seven sites he thought could make you a better PHP programmer for reading and keeping track of:

Developing in PHP isn't a textbook science. There's skill to it, and that skill comes from experience. Now, you could try your hand at every single PHP development challenge out there, or you could learn from the experiences of others, widely published on the web in blogs and developer portals.

Included in the list are sites like php|architect's C7Y site, Planet PHP and the the Zend Developer Zone (oh yeah, PHPDeveloper.org made the list too!)