Christopher Jones has posted to his Oracle blog today about the release of a new beta for the PECL Oracle (OCI8) drivers for PHP.
I've created a PECL OCI8 1.3.1 Beta bundle of the code with Connection Pooling support that I mentioned in http://blogs.oracle.com/opal/2008/01/31. You can get it from http://pecl.php.net/package/oci8. The README contains the details.
Of course, it's still in beta, so any testing and feedback is more than welcome. This bundle also includes several other "non-DRCP related bug fixes" including an issue that caused constant pinging for persistent connections.