Sendit by Giuseppe Surace is a mailing lists and newsletter plugin for WordPress to manage mailing list. It enables you to send newsletters and collect subscribers from your blog. You can manage one or more list and using in post/pages or using the widget(customizable). You can extract content from post or pages or create your content to send to subscribers. You can also edit the template for each mailing lists just put some XHTML code on header and footer. Newsletter will be send in XHTML format. Checkout the professional newsletter scheduler Sendit Pro to use with cron jobs: http://sendit.wordpressplanet.org
Download and info: http://wordpress.org/extend/plugins/sendit/
