WordPress 3.0 is finally released few hours ago, and here is the latest update to GD Custom Posts And Taxonomies Tools both Pro and Lite plugins. Some internal links are fixed and flushing rewrite rules changed to avoid problems with page not found messages.
Due to changes in order of initializing post types and taxonomies and creating rewrite rules, I had to change and improve flushing of rewrite rules after new post type or taxonomy is added. Some internal links are fixed (from plugins page). And, Pro version got new setting allowing for adding excerpt for pages.
Please report any problems with WordPress 3.0 and this plugin.