I have an email to let me know Google Checkout will be closing on the 20th of November.
I thought they had a good service and it was certainly nicer to deal with then the complete jokes that are World Pay and Sage Pay.
Then again, can you imagine if you had just forked out to develop Google Checkout integration. You could be losing several thousand pounds.
It really makes me think that you shouldn't rely on any Google Service. You would probably better dealing with a company that provides the service you want as their bread and butter. Its also a nice reminder yo make sure that code you write to access a service should abstract the implementation away nicely as you can't be guaranteed a service will last forever.