A Google Checkout problem has been reported in several places, I picked it up from Marcia writing in a WebmasterWorld thread (you need to be a member to access the thread).
Basically there is a concern that Google is removing affiliate information in the Google Checkout, so affiliates wont get paid for any sales they drive to a site using Google Checkout.
Matt Cutts (head of Google Spamwatch team) had already noticed it and reported it but noticed a posting in Threadwatch.org and immediately alerted the Google people who need to know to get it sorted. He also posted that he’d done so on Threadwatch.org
Nice one Matt. Good to see people are alert and are willing to take immediate action and follow-up.