Gregg

This plugin allows you to change the footer text on the bottom left of the admin page.
Once activated, navigate to the Settings -> nuAdmin Footer and change the Footer text/HTML. You can use html to link to your website, your help desk, your email or anything you would like. If you find the plugin to be useful and would like to donate, you can do so in the Settings.
Here’s a link to <a href="http://www.tripleginteractive.com/blog/wordpress/custom-admin-footer/" title="free wordpress plugin: custom admin footer" rel="nofollow ugc">the blog post on this topic</a> for more information. Future version’s will have much more capabilities.

nuAdmin Footer

This plugin allows you to change the footer text on the bottom left of the admin page.

Joost de Valk

Easily add breadcrumbs to your template. If you’re using one of the supported WordPress frameworks, it’s as easy as enabling the plugin and checking the “Try to add automatically box”, if you’re not using one of those, adding it is as simple as adding one line of code to your template!
<h4>Supported Frameworks</h4>
Currently the breadcrumbs plugin supports the following frameworks:
<ul>
<li>Thematic</li>
<li>Hybrid</li>
<li>Thesis</li>
<li>WP Framework</li>
</ul>
More info:
<ul>
<li><a href="http://yoast.com/wordpress/breadcrumbs/" rel="nofollow ugc">Yoast Breadcrumbs</a>.</li>
<li>Read more about how to improve your <a href="http://yoast.com/articles/wordpress-seo/" rel="nofollow ugc">WordPress SEO</a>, so you can get the most out of this plugin.</li>
<li>Check out the other <a href="http://yoast.com/wordpress/" rel="nofollow ugc">WordPress plugins</a> by the same author.</li>
</ul>

nuAdmin Footer vs Yoast Breadcrumbs