List all the terms (merged) of connected posts

Hi,

I try to do something but after hours of searching, I have to ask for some help. I display all the posts connected to my current post with something like that :

$connected = new WP_Query( array(
  'connected_type' => 'my_connected_type',
  'connected_items' => get_queried_object(),
  'nopaging' => true,
) );

...loop...

The loop is working very well but what I want to do is to display ALL the terms (from one taxonomy) of these connected posts, grouped in a single list (and with no duplicates) after the loop.

Have you any idea ?

Thank you very much !

http://wordpress.org/extend/plugins/posts-to-posts/