Hi Elliot,
The thing is that the “link” post type doesn’t show up in the list
I founr another thread about this here:
http://support.advancedcustomfields.com/forums/topic/external-link-option-for-page-link/
I also tried adding another plugin called “Bookmarks” and it does show up in the list but when selecting it it redirects to a page and not to the actual external link.
http://aaronparecki.com/articles/2009/06/26/1/wordpress
Thanks for your help,
Dan