If you are talking about that ad about Amberlight from Escape Motions, I've got that, and it is well worth taking a look at. That and Flame Painter, they are great for abstract backgrounds.

In any case, there is an "opt out" link at the bottom. And Kristi, there is also a manage your preferences link that errors out.

The mail is being sent from: newsletter@postoffice.renderosity.com

And the subject was: EXCLUSIVE PARTNER OFFER: Create Beautiful Computer Generated Art Now with 50% OFF

Strangely enough, there doesn't seem to be any way to get to the offer itself from the e-mail, you might want to bring that up with the marketing department.