There are two WordPress plugins for Piwik:
WP-Piwik is a WordPress plugin created by André Bräkling that integrates Piwik statistics with your WordPress dashboard.
Piwik Analytics created by Jules, a Dutch Piwik user, is a simple plugin to integrate Piwik with your WordPress templates.
The Piwik WordPress integration plugin features are:
- piwk.php and piwik.js location
- site ID setting
- options to control download tracking
- option to exclude the admin user (probably you)
If you want to participate and make the plugin better, we also have a trac ticket with some ideas.
Update: comments have been disabled on this post due to heavy spam. For any query about the Piwik WordPress plugin, please contact the author on the official plugin page.