This module provides an API for Drupal menu display modules. By itself, it only supports drupal's default menus, so you should probably only install it if another module tells you to.
Create Content Block extends the user inteface for creating content by providing a pulldown block of content types and a button for quickly creating new content, the block is OG aware and adds the group id to the links when on an OG page
It was primarily developed because the UI for creating content was clumsy, especially when comparing the difference between creating content when in and not-in an OG page.
But while this block is OG aware, it does not rely on OG. And it has definite value to non-OG sites by providing a simple create content block.
This module falls under the category of "let's improve the User experience". Since this module tries to improve the UI, the button text is configurable.