Articles
Custom Post Type Plugin
Custom post types are one of the coolest features of wordpress 3.0, this is one of the plugins to make it easier to add them.
Featured Post Type Widget
Another wordpress 3.0 plugin, not quite sure what this one does but it seems to be more specific to a widgeted area.
Turn WordPress into Multisite
Starting in WordPress 3.0 WordPressMU and WordPress have merged, this page on the codex explains how to enable your installation for Multisites
WordPress 3.0 Custom Taxonomies
Adding custom Taxonomies
Simple Custom Post Type Archives
adds friendly permalink support, template files, and a new conditional for public, non-hierarchical custom post type archives in WordPress 3.0!
Custom Post Type Review and Resources
Summary of sites with tutorials for Custom Post Types
Optimizing Site for view on I-Pad
Resources for optimizing your site for the I-Pad
Custom Post Type Template Plugin
Plugin adds custom templates for Custom Post Type enabled posts
WordPress 3.0 Custom Post Types-Another Look
Very thorough introduction to adding post types to your site
