WP Config
“NOTE: Since Version 2.6, wp-config.php can be moved to the directory directly above the WordPress application directory.”
In addition to this very nice tip from Trey/Webslinger, I also learned that you can override the home and siteurl database settings in wp-config (since 2.2!).
Also, since 2.6, you can change the location of the wp-content directory. This makes deploying Wordpress through SVN within and existing SVN project a lot easier without having to use external repositories or symbolic links.
