Introducing WordPress 3 Custom Taxonomies | Nettuts+
http://net.tutsplus.com/tutorials/wordpress/introducing-wordpress-3-custom-taxonomies/

$os_list = get_the_term_list( $post->ID, 'operating_system', '<strong>Operating System(s):</strong> ', ', ', '' );

Good overview - includes syntax registering taxonomies

Tutorial de wordpress 3 taxonomies

$term = get_term_by( 'slug', get_query_var( 'term' ), get_query_var( 'taxonomy' ) );

WordPress version 3 does not allow you to create custom taxonomies from the administration screen. To initially define your custom taxonomies without a plugin, you’ll need to add a little bit of code to your theme’s functions.php file. This isn’t too difficult — just follow my lead. To add custom taxonomies, we need to edit the “functions.php” file found inside your theme directory. For instance, I’m using the default “twentyten” theme that comes with WordPress 3.0, and my WordPress installation is in a directory named “wp.” My functions.php file is then at: [website_root]/wp/wp-content/themes/twentyten/functions.php.

Schau mir jetzt auch mal WordPress 3.0 etwas genauer an // The Essential Guide to WordPress 3.0 Custom Taxonomies http://bit.ly/c6HCQp #wp

In general, taxonomies are used to arrange, classify and group things. By default, Taxonomies in WordPress are tags and categories that WordPress is using for the posts. Apart from these two, WordPress makes it possible for theme developers to create their own taxonomies which are created within the functions.php theme file.

The essential guide to #WordPress 3.0 custom taxonomies http://dld.bz/h2dn