"auto_nodetitle" is a small and efficient module that allows hiding of the content title field in the form. To prevent empty content title fields one can configure it to generate the title by a given pattern.

When the token module is installed it's possible to use various node data for the
auto generated title - e.g. use the text of a CCK field (since 5.x).

Advanced

Combines autocomplete with a 'select or other' type of dropdown. The best / closest thing to select or other that I've found which works for taxonomy terms.

This module should be called something like, "Entity Reference Select, Edit, or Create widget"

Let's you arrange the fields in a form to be displayed in a custom layout. Check out this image:

Prepopulate an entity reference field based off of values in the URI (http://mysite.com/node/add/article?field_my_entity_ref=134)

A select or other for taxonomies. This is just a sandbox project but it seems like the best solution out there for Drupal 7.