David Angel

<blockquote>
This plugin takes the images attached to a post or page and creates a looping slideshow, just like the one above. It’s very simple right now, but I’ve got some other neat ideas for it in the future.
Usage is simple: 
 [photofade] – Displays slideshow of images attached to your post/page by Menu Order. Defaults to 4 seconds. 
 [photofade time=’5000′] – Displays the same slideshow with 5 second intervals, configured via milliseconds. 
 [photofade order=’random′] – Displays the slideshow in random order. Options are ‘sequence'(default), ‘random’ or ‘random_start’ 
 [photofade height=’350′] – Displays the slideshow at 350px tall. Control the height in pixels with this. Can also be set to ‘variable’ to allow for different image heights. Defaults to smallest image height. 
 [photofade styles=’off’] – Turns off default styles and use your own (you can use ‘photofade_custom’ class). Defaults to ‘on’.
If you enjoy this plugin, if it makes your life easier, if it saves you time, if you think it’s gorgeous in it’s simplicity, consider donating. I’d love to improve it more.
Note: Plugin works best if uploaded images are of similar size/dimensions.
</blockquote>

PhotoFade

Create a jQuery powered slideshow of the attached images using the [photofade] tag.

Randy Hunt

Create local copies of external images in the src attribute of img tags. This plugin extracts a list of IMG tags in the post, saves copies of those images locally as gallery attachments on the post.
<h4>Features</h4>
<ul>
<li>Finds all external images linked in the SRC attribute of IMG tags and makes local copies of those images</li>
<li>Allows the SRC to be updated to point to those local copies</li>
<li>Can be applied to posts in all categories, or only those selected</li>
<li>Can be applied to all authors, or only selected authors</li>
</ul>
Administrator has the option to replace the external src with the url of the local copy. Another option allows the plugin to be applied to all external images, or only to those on Flickr.
This plugin is particularly useful for photobloggers, especially those who update using the mail2blog Flickr API. The plugin will saved the linked image file from Flickr locally.
<h4>Planned features:</h4>
<ul>
<li>Add internationalization support</li>
<li>Integrate with Flickr API in order to allow always downloading the original image size regardless of which is linked</li>
<li>Additional options to allow running the plugin only for specific users or categories</li>
</ul>

Add Linked Images To Gallery

Makes local copies of all the linked images in a post, adding them as gallery attachments.

PhotoFade vs Add Linked Images To Gallery