Wonder if this had anything to do with eBay pulling their AdWords feed. In any event, eBay will not likely allow Google Checkout on eBay. While it is anti-competitive, just having Paypal on eBay makes the dispute resolution process more consistent. I think Google Checkout is better off fighting for marketshare off eBay. Many eBay sellers are complaining about lackluster performance on eBay (read: too much fees) and are looking to other channels to become more profitable. This is where Google Checkout can capture eBay sellers.