Uses lastRSS (http://lastrss.oslab.net/) for parsing a LibraryThing (http://www.librarything.com) user review XML file 
for display in a sidebar widget.

LibraryThing Recently Reviewed widget

Adds a sidebar widget to display your recently reviewed books at LibraryThing.

Claude Vedovini

That plugin offers shortcodes and widgets so you can display any public 
LibraryThing books collection in WordPress.
[books username=”username”]
Displays the books of the given LibraryThing user. This shortcode only uses the 
LibraryThing API and will work even if you don’t provide an AWS key pair.
Optional attributes are:
<ul>
<li><code>count</code>: Maximum number of books to show (default 20)</li>
<li><code>sort_by</code>: Sort order, either <code>entry_REV</code> or <code>random</code></li>
<li><code>template</code>: Template to use to render the list of books. Either <code>cover</code> or <code>list</code></li>
<li><code>tags</code>: Comma separated list of tags</li>
</ul>
[book isbn=”isbn”]
Displays the book with the given ISBN number. This shortcode uses the Amazon 
Product Advertising API and will not work if you don’t provide an AWS key pair. 
Also, not all ISBN can be found on all Amazon stores so you will have to carefully 
choose which store to use in the settings.
Optional attributes are:
<ul>
<li><code>template</code>: Template to use to render the list of books. Only <code>book-single</code></li>
</ul>
Customization
You can add new template or customize the existing ones by adding your own 
version in a folder named <code>librarything</code> in the <code>wp-content</code> folder on your 
server or in your theme folder. The name of the template file id the name of 
the template with the <code>.php</code> extension (e.g: the <code>covers</code> template file name 
is <code>covers.php</code>).
Disclaimer
This plugin is not endorsed by LibraryThing, it has not been developed by 
the LibraryThing team and its developer is not related in any manner to the 
LibraryThing team.
Image Credits: <a href="https://www.flickr.com/photos/universityofscrantonlibrary/3479643071/" rel="nofollow ugc">University of Scranton Weinberg Memorial Library (cropped)</a> 
License: <a href="https://creativecommons.org/licenses/by/2.0/" rel="nofollow ugc">Creative Commons Attribution 2.0 Generic</a>
<h3>Privacy Policy</h3>
This plugin does not collect any personal information from your visitors.

LT Unleashed

Great plugin and works well although I still can't get the single book feature working.

An issue is that LibraryThing don't supply the URLs from Amazon using HTTPS so if you have an SSL on your WP site the covers will be broken. Unless you do this:

Install 'Real-Time Find and Replace' and configure as follows:

Find 'ecx.images-amazon.com' and replace with 'images-na.ssl-images-amazon.com'

All covers will now be served via HTTPS.

Great plugin but doesn't work on HTTPS unless you use this hack

That plugin offers shortcodes and widgets so you can display any public

LibraryThing Recently Reviewed widget vs LT Unleashed