From a quick search on these forums I know many people have asked this before me but since it's not yet implemented I want to explain further.
I'm doing a TEDx website in which I need to linked speakers to talks.
I can do this with a Post Relationship but it's not good enough for these reasons:
1. I can't select a speaker on the 'Add Talk' page.
2. The UI is ugly on the 'Edit Talk' page.
3. It adds a giant UI element on the 'Edit Speaker' page, which I don't need.
[img]http://i.imgur.com/58FrMaQ.png[/img]
Instead you could add the a simple "dynamic select field", config it to use the post type Speakers and we're done.
Isn't this a much more elegant solution?
[img]http://i.imgur.com/4Q45xmC.png[/img]
An extension of this could also be made for a one-to-many dynamic relationship with a multi select field.
The perfect UI for both of these is Select2, freely available from http://ivaynberg.github.io/select2/.