Read this guide online at: http://mailchimp.com/resources/guides/how-to-use-google-analytics-with-mailchimp/
It's easy to find out if your email campaigns are affecting your website's traffic, or even generating revenue. MailChimp's Google Analytics integration gives you stats about that performance, and our Analytics360 plugin inserts that data right into your MailChimp reports. This guide walks you through your options.
Tips on using Google Analytics with MailChimp, including:
Activating Google Analytics
Viewing Analytics360 reports in MailChimp
Adding tracking to campaign archives