According to Wez in this latest blog post today, the PDO libraries (with the release of PHP 5.1) have been released as stable.

With the release of PHP 5.1 stable, it's time to mark PDO as stable too. I've pushed the first batch of stable PDO extensions out to PECL.

Now that PDO 1.0 is out the door, we can start looking at new features. I've put together a preliminary list of things, which can be found on the tip of the 5.1 branch.

So, if you'd like to contact Wez about new features for consideration, you can find his email contact at the bottom of the blog post. I'm sure a comment posted on it would work as well...