BatchBook has posted a handy screencast showing how to link their CRM with MailChimp to send a newsletter to your client list:

Seems like a handy way to setup a campaign to send to a targeted list of your clients. Just in time for the holiday season, too. Here’s a tip for Batchbook users: build a free holiday email template here, then add it to your MailChimp account. Now you’ve got professionally designed Thanksgiving and Christmas emails that you can send to your clients!