Wanted to highlight a slightly obscure feature we released a while back, but never really discussed. When you organize your campaigns into archives in MailChimp, our archive toolbar has a couple handy links:
The first is to "view past issues," which is useful, but the 2nd one is the interesting one. We actually generate an RSS feed of all your past campaigns. Your subscribers can follow your campaigns via RSS reader, but more importantly, you can use this feed to publish your archives elsewhere (like on your own website). See what else is on the MailChimp archive toolbar.