In a nutshell, it uses the power of Google Analytics to tell bloggers what kind of an effect they’re having on overall website traffic. We’ve made it super easy to tell if your blog posts (and email campaigns) are driving traffic to your website — it’s all embedded right in your Wordpress Dashboard!

You don’t have to be a MailChimp customer to use or benefit from this plugin. But if you do happen to have a MailChimp account, we’ll mash in your MailChimp campaign stats too, giving you a bird’s eye view of the cause and effect of all your hard work.

It’s so cool that words don’t do it any justice. You need to watch this video, then download the free plugin now:

UPDATE (07/21/09): Check out this little tip on segmenting your GA blog traffic reports from our own Stephen Martin

http://www.mailchimp.com/plugins/

[update: most of the Ruby on Rails "plugins" were actually API Wrappers and thus are on our API downloads page: http://www.mailchimp.com/api/downloads/]

The latest is from Scott Wilson, aka ThatSoftwareGuy, who created a discounts plugin for Zen Cart. Pretty nifty!

Developers, if you’ve got a plugin, be sure to tell us about it. If we post your plugin, we’ll send you a Chumby as a thank-you gift.