Konstantin Kovshenin

Use this widget to display your Flickr photos in your sidebar, via a Flickr username or a Flickr RSS feed URL.

Quick Flickr Widget

Display your Flickr photos in your sidebar.

Phil Ewels

This plugin creates a Widget to display a customised <a href="http://www.flickr.com/badge.gne" rel="nofollow ugc">flickr badge</a> on your WordPress site
You can specify:
<ul>
<li>Title</li>
<li>Number of photos to display</li>
<li>How to sort photos (Random or Latest)</li>
<li>Photo size</li>
</ul>
You can get public photos from either a flickr user, a flickr group or from the whole of flickr. Photos can also be filtered for a tag, or a user Set ID.
For more information, please visit the plugin page: http://www.tallphil.co.uk/flickr-badge/ 
You can also see the flickr page for the badge that this Widget embeds: (http://www.flickr.com/badge.gne)

Flickr Badge

This plugin creates a Widget to display a customised flickr badge on your WordPress site

Quick Flickr Widget vs Flickr Badge