The PL/SQL OCA is not like the DBA track. It doesn't have a clear cut version. If you look at the link below you will see you already have the most current OCA certification:http://education.oracle.com/pls/web_pro ... =appdev_9i
These exams have remained fairly static. For example, 1Z0-001 is the SQL & PL/SQL exam I took when I got my Oracle 7.3 DBA certification many years ago. Also, 1Z0-147 is the same exam that has been used for the developer track since it started.
The only natural upgrade for you to consider is the "1Z0-146 (1Z1-146) Oracle Database 11g: Advanced PL/SQL" exam, which is currently in beta. This would make you a full OCP PL/SQL developer. The contents of this exam include features already present in 9i and 10g, along with some from 11g. Most of the new content you need is covered in these articles:http://www.oracle-base.com/articles/10g ... nts10g.phphttp://www.oracle-base.com/articles/11g ... _11gR1.php