John Lim has posted an example of using the ADOdb software he's a developer on to clone the functionality of Zend's Zend_Db_DataObject.
The Zend Framework Preview edition is out. I had look this morning at Zend_Db_DataObject, which is an implementation of the Active Record pattern. After reading the tutorial, decided to implement something similar for ADOdb. After a couple of hours coding, I had an implementation that works with both PHP4 and PHP5, and provides a superset of the functionality described in the above link.
ActiveRecord, a method of database usage where the tables can "self-define" in your script (and you work with objects instead of messing with columns) is cropping up more and more, and John gives a code example of how it can be used inside ADOdb as well. He also mentions some of the advantages to using this kind of code/library, including the fact that it will work with both PHP4 and PHP5.
