Joost de Valk

Based on ideas in an <a href="http://www.kaushik.net/avinash/2007/11/blog-metrics-six-recommendations-for-measuring-your-success.html" rel="nofollow ugc">excellent post</a> by Avinash Kaushik this plugin calculates the following:
<ul>
<li>average number of posts per month</li>
<li>average number of words per post</li>
<li>average number of comments per post without your own comments</li>
<li>average number of trackbacks per post</li>
<li>average number of words used in comments to posts</li>
</ul>
and it calculates the same data for the last month, and for each author too!
Includes a widget for your sidebar too!
More info:
<ul>
<li><a href="http://yoast.com/wordpress/blog-metrics/" rel="nofollow ugc">Blog Metrics</a>.</li>
<li>Read more about <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>Other <a href="http://yoast.com/wordpress/" rel="nofollow ugc">WordPress plugins</a> by the same author.</li>
</ul>

Blog Metrics

Based on ideas in an excellent post by Avinash Kaushik this plugin calculates some statistics about your blog.

Blog Metrics vs Koko Analytics – Privacy Friendly Statistics for WordPress