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Stoob

This plugin adds voting functionality for posts. This function is similar to Reddit or Digg, in that visitors can vote for and against.
Guests can also vote for posts. This functionality can be disabled as well.
A widget can be displayed showing the most voted posts on your blog, giving further exposure to your popular posts.
A brief summary of what the plugin has to offer:
<ul>
<li>Visitors can vote for your posts, if they are allowed to</li>
<li>Easy management of post votes</li>
<li>Two-way voting: People can vote for or against your posts if feature is enabled</li>
<li>Post authors can be barred from voting their own posts</li>
<li>Initial vote count feature enables the voting of posts the moment they were published</li>
<li>Fairly customizable features</li>
<li>Top voted post widget gives greater exposure of posts your readers like</li>
</ul>
<h3>Requirements</h3>
<ol>
<li>
A working WordPress install
</li>
<li>
WordPress theme must contain a call to the <code>get_header()</code> function
</li>
<li>
WordPress theme must contain the WordPress loop
</li>
</ol>
Most WordPress installs have these, so you need not worry about these.
In addition, one must have JavaScript enabled in their browsers in order to vote.
WordPress 2.8 or above is recommended for this plugin.
<h3>Customizing</h3>
Votingfunctions.php
Within <code>votingfunctions.php</code>, there are several functions that can shows other information.
<pre><code>GetVotes($post_ID): Returns the number of votes associated with the post.

UserVoted($post_ID, $user_ID): Returns TRUE if the user already voted for the post, FALSE if the user hasn't voted for the post

GetPostVotes($post_ID): Returns an array of user IDs that have voted for the post.

GetPostSinks($post_ID): Returns an array of user IDs that have voted against the post.

SortVotes(): Returns an array of post IDs and votes. The array is sorted with the post having the most votes at the top of the array.
</code></pre>

Vote It Up

The Vote It Up plugin enables visitors to vote for and against posts.

Weborithm

Host Showdown popularity contests on your site and allow your visitors to rate their favorite things!
The plugin engages your visitors attention and hooks them on your site, as long as you have fun content to serve them!
<a href="http://test.weborithm.com/hotornot" title="Hot or Not demo" rel="nofollow ugc">Check out the demo site here</a>.
Bored of just images? No problem!
The plugin allows you to show other media like embedded videos, text etc… from your Competitor content area. We have an example of how to show Videos on our test site.
With a delightfully easy setup process you can start your first contest within a couple of minutes of installation. Visit the handy <a href="http://test.weborithm.com/hotornot/documentation/" title="Hot or Not documentation" rel="nofollow ugc">documentation</a> on our test site to get started. Quick help questions are answered within the plugin too.
Features include:
<ul>
<li>Upload as many Competitors as you like.</li>
<li>Add as many Groups as you like.</li>
<li>Use the shortcode generator to show Group based contests.</li>
<li>Easily edit your Competitors.</li>
<li>Display a transition message.</li>
<li>Customize colors to your theme.</li>
<li>Easily customize displayed text.</li>
</ul>
Official Site
For more information, and to take a look at the Pro version, visit our website – <a href="http://showdownplugin.com" title="Hot or Not Script" rel="nofollow ugc">ShowDown</a>.

Showdown

Showdown popularity contests on your site!

Vote It Up vs Showdown