Show submenu items on a page

I would like to show all submenu items on a separate page - like in the administration menus (admin/content, admin/build, ... )

Here's an example:

Menu:
- link1
- link2
-- sub1
-- sub2
- link3

Desired behavior:
When clicking on "link2" a page should appear that shows the following:

sub1
*description of the sub1 menu-item*

sub2
*description of the sub2 menu-item*

can this be done?
i've been searching drupal.org and the web in general but could not find any solution.

one approach might be a special content type. it could possibly be called "sublist".
to create a "parent" menu-item (like "link2" in the example above) you would use "create"->"sublist" to create such a listpage. as soon as pages would be appended to the "link2" menu-item the page would list those sub-items (links) like stated above.

This might become my first module, but before starting to do that I would want to make sure if there already exists a solution to this.

Any clues?