BizLetter is easy to customize and easy to edit e-mail newsletter, comes with 2 layouts:
Full-width one-column; and
Right-sidebar two columns layout.
This pack includes 5 colors: Green (default), blue, red, yellow, and gray.
All are available in HTML alongside with their PSD files for template customization.
BizLetter has been tested in all major e-mail clients, and what you see above in the preview is what you get in e-mail clients, the following link affirms that by showing screenshots of BizLetter in Gmail, Yahoo, Hotmail, AOL, Outlook 2007, Thunderbird. Link
A detailed documentation is included for easier edit and customization.
Fonts used is Aller: http://www.fontsquirrel.com/fonts/Aller and other windows fonts.
Keywords: e-mail, newsletter, business, colors, two columns