Edit the default Magento eMail Templates

How to edit the default Magento Email templates. They are stored in:
\app\locale\en_US\template\email\

Be aware that not all files in the folders need editing, and some templates have info in different spots, so be attentive.

Edit the following info:

replace alt=”Magento” with alt=”your store name”

replace Magento Demo Store with your store name

replace mailto:magento@varien.com with mailto:email@yourstore.com

replace dummyemail@magentocommerce.com with email@yourstore.com

replace (800) DEMO-STORE with (0800) YOUR STORE NUMBER

replace Monday - Friday, 8am - 5pm PST with your own store opening times and timezone

To replace the logo image, make a new image, (The default magento image is 169×49 for reference) name it logo_email.gif and put it here:
/skin/frontend/default/modern/images/logo_email.gif

You may also change aspects of the templates in the magento administration under
system –> transactional emails.

Source : http://blog.rogueeasyweb.com/?p=39