MailChimp has very kindly released an excellent plugin that hooks into your Google Analytics account to display your website statistics in your Dashboard. Analytics360° also ties into your MailChimp account to track your newsletter / email effectiveness and mashes up this information in relation to blog post and newsletter frequency – brilliant!
n.b. You do not need a MailChimp account to make use of this (but its recommended!)
From a client point of view, I have made a decision to include this with all my future client installs of WordPress and have begun using this on EminentStyle.com.
From a technical standpoint, your hosting must support PHP5 for the plugin to work.