Hi,
I have released the beta version of my database class called anyDB. It currently supports MYSQL, POSTGRESQL, SQLITE, ODBC and has a wrapper for ADODB. It works on php4 and php5.
I am still looking for people to test it and give me feedback. You can download the latest version here:
http://www.lennartgroetzbach.de/anydb-beta.php

Please send me you feedback.

Thanks...