Question: I want a writing panel for a custom field called 'Sub-title' and would like it to appear in its logical place in the Page editor (that is, between the title and the Page content). Is that possible? 

I would like to avoid having to create a custom post type, since a Page + custom fields is all I really need.

Answer: 
I'd like to also suggest the use of [WPAlchemy Meta Box](http://farinspace.com/wpalchemy-metabox/) for creating your meta boxes ...

Then do something like:

```
$custom_metabox = new WPAlchemy_MetaBox(array
(
    'id' => '_custom_meta',
    'title' => 'My Custom Meta',
    'template' => TEMPLATEPATH . '/custom/meta.php',
    'lock' => 'after_post_title', 
));

```
You could have a look at the excellent qTranslate. That should provide you with an example of everything you need since it adds a.o. multiple Title boxes.