DB Abstraction Layer - PHP

Anyone have suggestions on a good DB abstraction layer for PHP? So far I have come across the following choices: ---------------------------------------------------------------------------- ----- ADODB http://php.weblogs.com/ADODB Databases Supported: MySQL, Interbase, Oracle, MS SQL 7, Foxpro, Access, ADO and generic ODBC ---------------------------------------------------------------------------- ----- phpDB http://phpdb.linuxave.net/ Databases Supported: MySQL, MSQL, PostgreSQL, MS SQL, Sybase ---------------------------------------------------------------------------- ----- Metabase http://phpclasses.upperdesign.com/browse.html/package/20 Databases Supported: MySQL, MS SQL, Informix, Interbase, ODBC, Oracle via OCI, PostgresSQL ---------------------------------------------------------------------------- ----- My thoughts so far are that phpDB is going to be my best choice. It should be fast and easy to implement although it doesn't have nearly the number of features as the other two listed. The other features are nice but it looks like there is a great amount of overhead involved to just learn the syntax for them (especially Metabase) although it might pay off in the end. Has anyone used these solutions? Can you suggest any others? I know phpLib has some sort of abstraction layer but I am somewhat confused about phpLib's role now that PHP4 has been adopted. Can someone clue me in on phpLib's abstraction layer (and possibily other features I'm missing)? Thanks for your help. - Jamie