BlogMetrics is a WP Plugin that displays a summary of your blog’s stats.
Once installed it creates a submenu called Blog Metrics under your Dashboard.
It displays average number of posts per month, average number of words per post, average number of comments per post (without your own comments) and average number of words used in comments to posts.
The plugin also shows separate stats for different authors (if the blog has more than one author). I think that’s a great feature, it allows you to see the performance of each author (in terms of post length, comments, # of posts per month…etc). This could be useful to blogs like http://www.bloggingtips.com where there are many authors contributing to the blog.
Here is my stats
As you can see below, now I am writing longer posts than before 534 words per post, compared to 203 words per post before (stats goes back to 2005, I used to write short posts then). Readers are also writing longer comments now, average 177 words per comment compared to 73 words per comment before.

The stats shows 2 authors (above) because in the middle of this year when I went for a holiday, the blog was guest-blogged by one of the users (his status was set to author during this time).
Plugin page: http://www.joostdevalk.nl/wordpress/blog-metrics/



Hey, really cool plugin. Thanks for sharing.
I just installed it, very nice. Thanks for the heads up.