For the last several months I've worked on a site that helps businesses create online display ads. http://www.gigayo.com
Our goal is to help non-Fortune 500 businesses quickly and affordably create quality banners that can be used on most ad networks. We currently have about 60 templates that you can customize - more on the way. The price, at this early beta stage, is free. So feel free to make as many ads as you so desire.
Would love your feedback!