Pat Hawks

dirtysuds

Once activated, Gallery posts will have an excerpt that is a row of thumbnail images from that post, rather than some (often not descriptive) text. 
This excerpt should appear in your archive pages, and perhaps elsewhere, depending on your theme.
Note: The post must actually have the post type ‘Gallery’. It cannot just be a post with a gallery in it.

Gallery Excerpt

Replace the excerpt for posts with the post type 'Gallery' to a row of images from the post.

Will embed a PDF file using Google Docs Viewer 
Simply include the URL for a PDF document on it’s own line, or wrapped in the embed tag like <code>[embed]http://example.com/file.pdf[/embed]</code> and the plugin will embed the PDF into the page using the Google Docs Viewer embed code. 
The url must end with <code>.pdf</code>
Supported attributes in the embed tag are <code>class</code> <code>id</code> <code>title</code> <code>height</code> and <code>width</code>

Embed PDF

Adds pseudo oembed support for PDF documents

Gallery Excerpt vs Embed PDF