I’ve open sourced a couple of new WordPress plugins.
GMT MailChimp let’s you create barebones MailChimp signup forms.
It asks for just a single piece of information—an email address—to maximize conversion rates. And unlike most MailChimp plugins, it allows you to optionally add people not just to a specific list, but also to a group within that list for segmented marketing.
When someone purchases a specific product or uses a specific discount code, you can add them to a MailChimp list, and optionally, to a group as well.