Some constructive criticism on the documentation for "Custom Post Types"...
Under the paragraph...
"Adding a custom type to WordPress is done via the register_post_type function. This function allows you to define the post type and how it operates within WordPress."
I wish you would be more specific when stating
"Adding a custom type to WordPress"...
Where in word press? Under the theme code? plug in code? config code?
Right now the language seems to speaking to user that have been using the product. I feel like if you speak to both new developers and experienced developers it would benefit your adoption rate.
I hope this helps! =D