The Easy Peasy MailChimp plugin allows you to easily add an ajax powered MailChimp newsletter subscribe form in any page of your WordPress site.
Install, add your chimp API and list code. Shortcode is on the right after you save settings. You have to choose double-opt in or welcome email.
The addon displays only: email address and input box, and a (dark blue) subscribe now button. I added it to a sidebar and added some text. easy peasy.
This Ajax form is superior as it accepts subscriptions and does not refresh the page or redirect to mailchimp. http://www.feritation.com/home/blog/
Really nice and simple plugin, better than the official mailchimp plugin because it allows subscription without page reload! Also easy to style with css
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