Gonna try out the CodeIgniter PHP framework for some small at home projects. Originally, I was gonna go with the Zend framework, but searching around a bit this seems like a better option. Its fast and it supports PHP4 and PHP5 and has a BSD/Apache type license. Also, you get all the standard MVC stuff in a simple easy to use package. Hopefully there will be some more posts about this.
Currently I am planning on using the following book to get up to speed.