Aaron Kittredge

Using this widget you can easily place the Kobo containing an image of the cover of the book you are reading in the sidebar. You can also specify a URL to link to when clicking on the book cover image. Supports multiple instances, so you can use it multiple times in multiple sidebars. (adapted from the Simple Image Widget)
Once the plugin is enabled, the widget will be available in your widgets list as “Kobo Widget”. You can add this widget to sidebars as many times as you need. The control interface allows you to specify the following options for each instance of the widget:
<ul>
<li>Image URL: The full URL to the image file</li>
<li>Alternate Text: Shown by the browser if image cannot be displayed</li>
<li>Link URL: URL to open when the book cover image is clicked on (optional)</li>
<li>Open link in new window: If this is checked, the above link URL will open in a new browser window</li>
</ul>

Kobo-Widget

The simple way to show what your reading on your Kobo or e-reader.

Jason van Gumster

You can upload your book cover image (or choose it from the WordPress Media Library if you’ve already uploaded it), enter the book title, and add links to 5 separate vendors:
<ul>
<li>Amazon</li>
<li>Nook</li>
<li>Kobo</li>
<li>iBooks</li>
<li>Google Play Books</li>
</ul>
A widget for that book appears in your sidebar with links to all of the vendors you entered. You can add as many book widgets as you would like.

Book Widget

I'm a little biased, but I definitely think it's a useful little widget. Please let me know if there's anything you'd like added or changed.



Well... I wrote it

A simple widget for adding links to your books for sale on sites like Amazon, Kobo, Nook, etc.

Kobo-Widget vs Book Widget