Auction Watch for Google Desktop
Jan-2007
I have just discovered a rather neat application for Google Desktop – auction watch. This gadget will allow you to monitor eBay auctions from your desktop without having to log into eBay. It will also notify you a user defined number of minutes before an auction is about to close so that you can put that all important last minute bid in.
The gadget will automatically add auctions as you browse eBay, or item numbers can be added manually.

The gadget requires Google Desktop to work.  The app won the a eBay developers challenge in 2006