Creating custom posts types is a great way to customize your WordPress website and expand the database functions. You can create custom post type easily by using a plugin. Or you can build the functionality in with code. I have listed some handy resources available for custom post types that I have found useful.

Randy Jensen has a great video about building custom post types. He has developed a set of icons for custom post types that you can also download from this post. http://randyjensenonline.com/thoughts/wordpress-custom-post-type-fugue-icons/

Here is a good article about how to add custom post type icons by Devin at WP Theming. http://wptheming.com/2010/11/how-to-use-custom-post-type-icons/

This site is called Custom Post Type Generator. It is amazing. You fill out some fields and the code snippets you need are automatically generated for you.
http://generatewp.com/post-type/

This is the codex insertion about Custom Post Types. http://codex.wordpress.org/Post_Types