635 (Width) x 150 (Height)
I'm really not that picky on what goes up here except it must look professional with high resolution graphics that are crisp and clear.
It should include the logo (just the boxes) from the image below.
[login to view URL]~website/images/stories/[login to view URL]
Examples of ones that I do like:
[login to view URL]
[login to view URL];AID=10294280&PID=1238355