Another feature we launched in v4.1.1 is the ability to add your own Google Analytics tracking code to your MailChimp-hosted campaign-archive pages. That way, you can measure how many subscribers are visiting the hosted versions of your campaigns.

Just go to Lists -> Settings -> Integration Code -> Google Analytics on Archives

If you’re going to be in your List Settings, we recommend you also check out the following:

• Activate your campaign-archive toolbar
• Add a subscriber counter chiclet to your web page
• Go to Lists -> List Tools and get your secret email address so you can do this.