I am in love with the Smashing Magazine site, as it's a fabulous reference site for web devs (although admittedly, they have a focus on design topics as opposed to coding). Their tagline is "we smash you with information that will make your life easier. Really." and they do live up to that. I've been keeping an eye on them for a long time, and if you don't have them in your feed reader, or on your list of favorites then you really should.
Their latest post, entitled, "Frameworks Round Up: When to Use, How to Choose" is a great upper-level synopsis of frameworks, not just for PHP, but for other languages as well. There may be framework names floating around that you weren't quite sure about... or maybe you just want a good place to send someone who's looking for a laundry list or a quick blurb about MVC.
At any rate, this is a nice place to go, and a great website.