I've been having some success with a 160x600 wide skyscraper built using the eBay Editor Kit. Here's the code: <script language="JavaScript" type="text/JavaScript" src="http://lapi.ebay.com/ws/eBayISAPI.dll?EKServer&ai=iycreyrc%3adrvet%7f%3aryp%7eyrd%3aqvf&bdrcolor=000099&catid=36256&cid=0&endcolor=FF0000&endtime=n&fntcolor=000000&fs=0&gallery=n&hdrcolor=000099&img=n&num=6&numbid=n&popup=y&prvd=1&&sid=leftmenu;siteid=0&sort=MetaEndSort&sortby=endtime&sortdir=asc&srchdesc=y&tbgcolor=e3e3e5&title=Gun+Accessories&tlecolor=e3e3e5&tlfcolor=e3e3e5&track=1485068&width=160"></script> Code (markup): The code should be pretty easy to read. It shows the items in category 36256 which are going to close soon. You could also make the code perform a search for you. You can see the code in action by clicking here: eBay 160. I am using this in place of an AdSense ad block and seeing pretty decent returns. You might try something similar on one of your sites. If you do, please post back here and let us know how it worked for you.
Cool, to be honest I've not used the Editor Kit, but it could make a difference in some of my sales. I'll be happy to keep ya posted.
The Editor Kit works well for me when I manually customize it for every page. It's a bit of work, but it pays off in the long run.