charlier - 10:00 am on Jan 19, 2004 (gmt 0)
Another automated way to do it would be to include standard code in the newsletter that would pull down an image. The URL of the image would contain a unique id for each publisher_newsletter. The publisher sends a copy of the newsletter to google an hour in advance of sending out the newsletter to subscribers and google's software analyses the newsletter and creates the appropriate advertisement image. The publisher then just increments the newsletter id portion of the image URL for his/her next newsletter.