Trying to learn about PHP frameworks

A recent discussion on PHP frameworks on the PHP mailing list got me thinking about how I could use them to rewrite some of my DB projects. I looked into a few of the frameworks brought up in the discussion, and they look interesting. The frameworks I picked up on were the MVC (model-view-controller) types, which reminded me of the event-based OO programming style of Objective-C on NeXTStep.

They also made me realize that I'd really be pushing my meager programming skills to the edge trying to figure out how these things work and how to use them. It's also going to take me a good bit of time to learn them too, which is something that always seems to be in short supply these days.

Well, add one more thing to my ever growing list of things to learn :)

Couple of useful articles I stumbled upon over at that might help me get started.
Understanding MVC in PHP
Implementing MVC in PHP: The Controller
Implementing MVC in PHP: The View
Implementing MVC in PHP: The Model

A list of different PHP frameworks: MVC Frameworks Written in PHP
WASP looks interesting.