Attached Link: http://www.renderosity.com/messages.ez?ForumID=106

We had a similar challenge over in the Carrara forum, (http://www.renderosity.com/messages.ez?ForumID=106) And the size that was decided for over there was 500x100. Otherwise people with small screens, (smaller then 1024x768) the page won't have to scroll sideways just for the banner. Just my 2 cents. :>