Take a look at this post for a list of useful “hidden” configuration settings for your WordPress installation.
I found some nice tricks that I’ve applied to my wp-config.php:
// Number of post revision to keep define('WP_POST_REVISIONS', 3); // Installation path and template path to reduce database queries define('WP_HOME', 'http://your_site_url.com'); define('WP_SITEURL', 'http://your_wordpress_directory_url.com'); define('TEMPLATEPATH', '/absolute/path/to/wp-content/themes/active-theme'); define('STYLESHEETPATH', '/absolute/path/to/wp-content/themes/active-theme'); // Security keys to improve cookies encription define('AUTH_KEY', 'randomKey'); define('SECURE_AUTH_KEY', 'randomKey'); define('LOGGED_IN_KEY', 'randomKey'); define('NONCE_KEY', 'randomKey');