MailChimp announced a sweet free add-in called Analytics 360 that displays the integration of analytics into other tools of a campaign. For example, Analytics 360 can incorporate Google Analytics and MailChimp data in a WordPress user interface. The benefit allows users to view analytics data without leaving WordPress, making coordination of blog, email, and website performance such as conversion and campaign ROI convenient (It is also an excellent example of how analytic solutions are coming from other sources beyond analytics providers).
You can read more at the Analytics360 plugin page. Then read this blog post on using GA with Mail Chimp. BTW, there is a great mention of Justin Cutroni, a GA expert and blogger for the EpikOne team (I learned about analytics under the first EpikOne Online Marketing Bootcamp. Great bunch of analytics evangelists!)
Full disclosure: Zimana uses Mail Chimp and Google Analytics. No payment for mentioning these services occurred (At Zimana, we’re naturally enthusiastic for analytics tools! — smile).