Fantastical looking announcement template from Rogie King for Flexibits. For starters, it's really simple, lightweight and pleasing to the eye, with clever CSS flourishes like the page curl in the bottom right corner.
I would suggest that the unsubscribe text in the footer use a darker, more contrasting colour, just to stand out a bit more. As an announcement, it could have also benefited from the addition of Twitter and Facebook social sharing links to help spread the word.
Sign up for free.
Then send campaigns for as little as $9/month