In WordPress 3.0, the devs introduced a new navigation menu system. In 3.1, they are going to include an internal linking dialog for the editor.
One problem is that when it comes to selecting a page, it is barely impossible to distinguish between pages having the same name, turning those nice features into a nightmare when you come to have a lot of pages:
One of our developer has solved it by showing the parent post for posts having a parent. The result is bellow:
To get there, WordPress needs to be patched, no plugin can get such a result. So, our developer has submitted the needed patches to WordPress devs. It is, most of time, really difficult to have a patch included in WordPress. So keep your fingers cross fro 3.1…
To follow the bug report on WordPress trac: # 13499