My man Alan Lewis evangelised Google to use eBay Web services to write a plug-in for their Google Desktop application.
It’s quite nice and takes advantage of a not-well-announced new rate limiting feature that you should expect to learn more about later this month. :) No particular reason for the suspense, except that I’ve been too busy to give it the proper attention it needs.
If you’re the type of person that runs Google Desktop and uses eBay, you should pick it up.