You can get it for FREE here http://www.magentocommerce.com/extension/1796

ABOUT CAKEMAIL SYNCHRONIZATION  FOR MAGENTO:

Synchronizes Magento Newsletter subscribers with CakeMail

This module provides integration with CakeMail email marketing system using their integration API.

You only have to set up your CakeMail credentials, customer email and List ID you want to synchronize. Once setup, the module will keep your Magento Newsletter subscribers automatically synchronized with CakeMail.
Synchronization is per store and not globally.

A tool to make a Batch Synchronization is available on the “Newsletter / Subscribers” Admin page. This tool is meant to be used the first time you install the module, or, if for some reason the Mail List gets out of sync.

We encourage you to review and rate this extension based on your experience, any positive, neutral or negative feedback is welcome to make this extension better. Thanks!

***As usual, do not install extensions directly on your Live setup, try it on a Test setup first. Also, it is a good practice to make backups of both Magento and CakeMail before installing this extension ***

[08/14/2009] First version released