Email marketing service Mailchimp released an impressive free plugin today which displays tracking data from Google Analytics and its own email analytics data.
The Analytics360 Plugin provides a comprehensive view of a blog's performance, allowing publishers to quickly identify which posts are enjoying the most inbound traffic whether from web site referrals or by email. The traffic-over-time chart shows when a post was published or an email campaign was sent in relation to the numbers of site visits.
MailChimp supports email for blogs with its RSS-to-Email option that updates subscribers whenever a new post is published. MailChimp also developed a simple to install Wordpress plugin to manage email list signups.
The Analytics360 plugin from Mailchimp is available within the WordPress Plugin Directory.