Custom Post Type UI provides an options page that allows you to create and manage both custom post types and custom taxonomies. Post Type Switcher allows you to convert your old posts and pages to new content types.
Taxes (core.trac.wordpress.org/attachment/ticket/6357/taxes.php) demonstrates custom taxonomies by adding a tag field for "people" to posts, pages, and media attachments. It works, but it's out of date; see the Custom Content Types and Taxonomies chapter for an updated version.
PODS (pods.uproot.us) provides a framework for creating and using custom content types.
Custom Field Template, Magic Fields, and Flutter all add boxes to edit screens and allow you to define custom post types.
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