tengutech

The Australian government is proposing to introduce mandatory ISP level Internet filters in Australia. These will operate using a secret blacklist of URLs maintained by the ACMA.
This plugin is to help people participate in The Great Australian Internet Blackout. The protest against the proposed filters aims to blackout websites from 25 to 29 of January.
When activated this plugin displays a message about the protest to each visitor. The message can be clicked away, and will not appear until next time they start their browser and visit your site (i.e. once per session).
More information about the protest can be fount at:
<ul>
<li><a href="http://www.internetblackout.com.au/" title="Protest campaign against Australian Internet filters" rel="nofollow ugc">The Great Australian Internet Blackout</a></li>
<li><a href="http://www.nocleanfeed.com/" title="Stop Internet Censorship in Australia" rel="nofollow ugc">No Clean Feed</a></li>
</ul>
To Do List
<ul>
<li>Add a check so that it displays only during the protest period.</li>
<li>Add an admin section so you can make it display anytime, overriding the automatic date checking.</li>
</ul>

Australian Internet Blackout

Displays the Australian Internet Blackout protest on your blog. Automatically adds the necessary JavaScript.

ichurakov

The plugin adds small protest box to your website. By default it’s collapsed, but once clicked, the “Stop SOPA” box appears.
On settings page you can specify the position of the protest box: either at the right bottom corner or at the middle right edge. 
You also can turn on/off “Blackout Day” option. In this case website will show black screen (click demo link below to view the screenshot) and return 503 status (no problems with search engines) on 18th January 2012, 8:00AM – 8:00PM (server time).
By placing this box on our WordPress websites we are protesting against of SOPA.
You can see demo here: <a href="http://www.icprojects.net/stop-sopa.html" rel="nofollow ugc">Stop SOPA</a>.

Stop SOPA

This plugin adds small protest box to your website and switch it to "Blackout Day" mode on 18th January 2012.

Australian Internet Blackout vs Stop SOPA