[Steven Zahm]

@ kevin

The custom metabox and field API support was release back in the end of March. I’ve released several plugins that utilitize it:
http://wordpress.org/plugins/connections-business-directory-hours/
http://wordpress.org/plugins/connections-business-directory-income-levels/
http://wordpress.org/plugins/connections-business-directory-education-levels/
and coming soon:
http://wordpress.org/plugins/connections-business-directory-languages/

There not a point and click method of adding custom fields. The API is a dev level resource. If you need something specific, I can recommend a dev that has plenty of experience working with the API.

Hope that helps!