I love the mailchimp plugin, but it does suffer from a couple of customisation challenges (which are needed to avoid need for clients to get involved in code).
Could we have an option that allows us to add our own HTML/text below the title of the widget, but above the form. So that we can create a list of reasons why people should sign up to the newsletter?
Additionally, a choice of buttons for the subscribe button would be lovely too!
(I've flagged the plugin as working and left a great rating too).