Nadav Rotchild

Combined Image and Text Widget is a plugin that allows you to effortlessly add text and images to your sidebars, with or without links.
<h4>Features</h4>
<ul>
<li>Easily add images to your sidebar using the native WordPress media uploader.</li>
<li>Add classes, an id, an image alt and a link to your sidebar widget without touching any code.</li>
<li>Supports WPML multilanguage capabilities.</li>
</ul>

Combined Image and Text Widget

A widget plugin for text and image combinations, with multilingual support.

Gennady Kovshenin

Dugonja

This plugins embeds image links in comments with the img tag so the image are visible in your comment timeline.
Image formats supported: 
1. .jpg 
2. .gif 
3. .png
You can specify your comment width so the images are fitted nicely. Images are not hosted on your server neither this plugin pickups any data.
Do note that people can link extremely large images and your page loading can be compromised because of that.
Demo: 
<a href="http://www.ascic.net/embed-comment-images/" title="Embed Images in Comments" rel="nofollow ugc">Embed Comment Images</a>

Embed Images in Comments

Plugin contains a security issue. Do not use right now.

Updated: very simple and to the point :)

Simple

Embed direct image links in your comments with an img tag.

Combined Image and Text Widget vs Embed Images in Comments