I recently discovered a website that sells HTML email templates for newsletters and promotional emails at very reasonable prices. So if you're in need of a new template, you might want to check it out.
It seems they are adding new templates very regularly and you can even have some of the templates customized by the designer.
Disclaimer: the links in this post are affiliate links, which means I make a few bucks if you decide to buy a template from them. If affiliate links bug you, feel free to go directly to their site, my feelings won’t be hurt ;-) They're at themeforest.net.
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Tamara Gielen is an independent email and digital direct marketing
consultant with over 10 years of experience in online, email and direct marketing. 
great stuff. like to see that there are some nice looking designs ready made when it comes to html email. thanks for sharing.
Bradley A Giddens
Founder / Freelancer
Stitch Marketing
Posted by: Bradley A Giddens | Mar 16, 2010 at 05:51 AM
That's cool, Tamara! Just yesterday I posted on my blog about how I was having trouble finding something like this that would give you ideas for email design. I'm glad I finally found it.
Posted by: Daniel Kuperman | Mar 10, 2010 at 07:02 PM