If you are using Drupal to power your website, you may be interested by the Piwik Integration for Drupal plugin.
The module automatically adds the Piwik tracking code in your drupal website, as well as providing the following features:
- Selectively track certain users, roles and pages
- Monitor what files are downloaded from your pages
- Cache the Piwik code on your local server for improved page loading times
- Direct access to statistics in reports section (D6+) using Piwik widgets and API