There is lots of information out there on how to customize meta boxes added with add_meta_box(), such as enabling WYSIWYG editors on textareas and uploading images.
What I have yet to find is a way to reuse WordPress 3.1 Internal Linking feature. Many of my custom fields contain urls to other pages on the site. The new Internal Linking feature would make it a lot easier for my users to find a page URL rather than having to remember it of cut & paste it.
Is the new Internal Linking feature reusable in conjunction with add_meta_box()?