wp3.0-functions.php

<?php
 
//Custom nav menu support
add_theme_support('nav-menus');
//Usage: wp_nav_menu(array('sort_column' => 'menu_order', 'container_class' => 'menu-header'));
 
//Automatically add Feed links
add_theme_support('automatic-feed-links');
 
//Post thumbnails (was available in v2.9)
add_theme_support('post-thumbnails');
//Usage: the_post_thumbnail();
 
//Custom background
add_custom_background();
 
//Custom header
//The %s is a placeholder for the theme template directory URI.
define('HEADER_IMAGE', '%s/images/header.png'); //The default header
define('HEADER_IMAGE_WIDTH', apply_filters('', 800)); //Width of header
define('HEADER_IMAGE_HEIGHT', apply_filters('', 200)); //Height of header
define('NO_HEADER_TEXT', true);
add_custom_image_header('', 'admin_header_style'); //This Enables the Appearance > Header
//Following Code is for Styling the Admin Page
if(!function_exists('admin_header_style')){
	function admin_header_style() {
		?>
		<style type="text/css">
		#headimg {
		height: <?php echo HEADER_IMAGE_HEIGHT; ?>px;
		width: <?php echo HEADER_IMAGE_WIDTH; ?>px;
		}
		#headimg h1, #headimg #desc {
		display: none;
		}
		</style>
		<?php
	}
}
 
//Custom post types and taxonomies example
function post_type_albums() {
	register_post_type(
		'albums',
		array(
			'label' => __('Albums'),
			'public' => true,
			'show_ui' => true,
			'supports' => array(
				'post-thumbnails',
				'excerpts',
				'trackbacks',
				'comments'
			)
		)
	);
 
	// Adding the Custom Taxonomy for Genres. Here we can create categories specific for this post type.
	register_taxonomy( 'genres', 'albums', array( 'hierarchical' => true, 'label' => __('Genres') ) );
 
	// Adding the Custom Taxonomy for Performer. Here we can add tags specific for this post type.
	register_taxonomy('performer', 'albums',
		array(
			'hierarchical' => false,
			'label' => __('Performer'),
			'query_var' => 'performer',
			'rewrite' => array('slug' => 'performer')
		)
	);
}
add_action('init', 'post_type_albums');
 
?>

Posted on http://www.gilbertpellegrom.co.uk/the-wordpress-3-0-functions-php-file/