Drupal (Site Builder) Usability module

the Drupal usability module, Book module edition:

move Book module's Add child page link to the action links location.

make an Add book action item (or items if multiple content types are enabled) to the book listing page at admin/content/book

Content Gallery

actually, you'd want to see an example of one entity of each entity type per build mode! All conveniently linking to the respective manage displays page.

Benjamin Doherty's functions to add content type field manage and display contextual links to nodes will help this and also solve that problem of knowing what content type a node is. https://gist.github.com/817801

Better Multiple Value Form Elements

Allow the number of repeated fields shown on a form to be set separately from the maximum number of values.

(not sure this one best fits in with administrator / site builder experience)

Permissions

permissions link from the content type page to the node Content type name: permission part of the permissions page.

Style Usage list

• show what image styles are used where
  (not sure how do-able this is)

SEE ALSO:

Comparison of User Interface tweak modules and edit form modifications
http://drupal.org/node/721392

Attached administrative view by avillanueva: "I created a custom content management interface with views. Far faster than Content Management Filter and the default manager when you have tens of thousands of nodes (30K right now on this client site)" (attached)