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How can I add custom meta boxes to my custom post types?

The More Fields plugin does a great job at creating custom meta boxes and fully supports custom post types: http://wordpress.org/extend/plugins/more-fields/

I changed my custom post type name and now I can't get to my posts

You can either change the custom post type name back to the original name or try the Post Type Switcher plugin here: http://wordpress.org/extend/plugins/post-type-switcher/

I upgraded the plugin and all of my custom post types broke

v0.5 reworked how custom post types are stored. You need to delete and recreate your post types. You will NOT lose any content by doing this.

I receive a 404 error when viewing custom post type content

This is usually caused if the rewrite slug was changed. To fix this issue simply visit Settings > Permalinks to flush the rewrite rules in WordPress

Will this work in previous version of WordPress

The register_post_type function was added in WordPress 2.9 so technically it should work in 2.9, but there is no admin menu UI so all post types are created and used behind the scenes.

I'm getting an error: Undefined offset

v0.3 reworked how custom taxonomies are stored. You need to delete your current taxonomies and recreate them in the new version for this error to go away.