Interesting, well written, discussion of one MVC framework done in PHP. I am not attracted to it due to the use of XSL, but the writeup itself is worth reading.
MVC Design Pattern for PHP by Tony Marston
A series of articles on doing MVC in PHP with a different framework.
PHP or Ruby on Rails? In the authors mind, PHP is the winner, with the main caveat--use what you already use/know.