Now that Drupal 6.19 has been released, we have updated to it in order to provide a range of security enhancements. If your site was built in Drupal 6, you will have received this update, and you will probably not notice any difference, but your site will have improved security from now on.
If you'd like to see a full list of what has changed, you can check out the release notes. If you'd like to know whether this update has affected you or would like to know more about it, please get in touch via the contact details at the bottom of the page or via the contact page itself.