EBay just changed its policy to exclude Google Checkout from its accepted payment options, keeping PayPal in clearer pastures. eBay Strategies, lists the ins and outs: “In reality it’s a credit card gateway (and the same one eBay spends millions with as the top google AdWords user) and credit cards are specifically allowed along with gateways (verisign/cybersource/authorize.net, etc.)”
Definitely a hamper on that big IF of Checkout’s success that Om talks about, on the potential it could play in Google market development towards a pay-for-performance or cost-per-action system.