Corey

<a href="http://www.add-art.org/" rel="nofollow ugc">Add-Art</a> is a <a href="http://www.mozilla.com/en-US/firefox/" rel="nofollow ugc">Firefox</a> plug-in that replaces website advertising. Created with support from <a href="http://eyebeam.org/" rel="nofollow ugc">Eyebeam</a> and <a href="http://rhizome.org/" rel="nofollow ugc">Rhizome</a>, Add-Art releases new art shows every two weeks and strives to feature contemporary artists and curators.
The plugin works alongside <a href="http://adblockplus.org/" rel="nofollow ugc">AdBlock Plus</a>, which blocks online ads, and simply replaces that blank space with art images. AdBlock Plus is the most popular of the thousands of available add-ons for Firefox with 18 million total downloads (as of May 2008) and over 250,000 downloads per week.
For many, replacing ads with blank space would be enough. AddArt attempts to do something more interesting than just blocking ads – it turns your browser into an art gallery. Every time you visit the New York Times online or check the weather you’ll also see a spattering of images by a young contemporary artist.
The project is supported by <a href="http://add-art.org/" rel="nofollow ugc">add-art.org</a> which provides information on the current artists and curator along with a schedule of past and upcoming AddArt shows. Each 2 weeks will include 5-8 artists selected by emerging and established curators.
Images need to be cropped to standard banner sizes or can be custom made for the project. One group of images is shown per page. The curatorial duty is passed among curators through recommendations, word of mouth, and solicitations to the Add-Art site.
With the overwhelming popularity of adblockers, if Add-Art were to attract 5% of existing users, the numbers would be in the hundreds of thousands. Add-Art can bring contemporary art to the desktops of all types of people at home and in their workplace – all over the world.
Would you like to see art instead of ads as you browse sites online? Go to <a href="http://add-art.org/" rel="nofollow ugc">add-art.org</a> and download the plugin for your Firefox browser now.

Add-Art

Add-Art is a Firefox plug-in that replaces website advertising, created with support from Eyebeam and Rhizome.

Automattic

Donncha O Caoimh (a11n)

This plugin adds a stylesheet or image to your blog’s html source code. When a browser loads that stylesheet or image a cookie is dropped. If that user then leaves a comment the cookie is checked. If it doesn’t exist the comment is marked as spam. 
The plugin can also check how long it took a user to enter a comment. If it’s too fast it’s probably a spam bot. How fast can a legitimate user enter their name, email, web address and enter a well thought out comment?
For the adventurous, add these lines to your .htaccess and it will block spam attempts before they ever get to WordPress. Replace the Xs with the cookie that was set in your browser after viewing your blog. You can also find the cookie value by examining the page source code and looking for “css.php?k=XXXXXXXXXXXXXXXXXXX”. Make sure the lines go above the standard WordPress rules.
<pre><code> RewriteCond %{HTTP_COOKIE} !^.*XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX.*$
 RewriteRule ^wp-comments-post.php - [F,L]
</code></pre>
If you use WordPress MU, replace wp-comments-post.php above with wp-signup.php to block spam signups.
<pre><code> RewriteCond %{HTTP_COOKIE} !^.*XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX.*$
 RewriteRule ^wp-signup.php - [F,L]
</code></pre>

Cookies for Comments

If you don't use any other spam filter plugins, then you can rely on this to stop spam comments for sure!

Must have, if you don't use any other spam filters!

I'd been getting a dozen spams a day on two of my sites. We installed "Stop Spam Comments" on one and "Cookies for Comments" on the other. Both worked perfectly. No more spam. Thanks!



very easy and no more spam!

Sets a cookie on a random URL that is then checked when a comment is posted. If the cookie is missing the comment is marked as spam.

Add-Art vs Cookies for Comments