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This code-only developer plugin allows you to register new post types easily, with good default values and some extended functionality.

It gives 3 functions, each that wraps or extends a core WordPress function with a few extras:

1. sld_register_post_type( 'type', $optional_args, $optional_custom_plural ) which extends register_post_type()
2. sld_register_taxonomy( 'taxonomy', $post_types, $optional_singular_name, $optional_args, $optional_plural_name ) which extends register_taxonomy()
3. sld_unregister_taxonomy( 'taxonomy', $object_type ) which unregisters taxonomies (core taxonomies or those registered by other plugins)

We use it in many of our sites here @ http://stresslimitdesign.com and here @ http://jkudish.com

Originally based on the work of Matt Wiebe @ http://somadesign.ca/projects/smarter-custom-post-types/

Awesome custom admin icons designed by Laura Kalbag http://laurakalbag.com/wordpress-admin-icons/

You can follow development of this plugin on GitHub @ https://github.com/jkudish/sld-custom-content-and-taxonomies