Whilst looking at what was happening with Mobile Search over on SearchEngineWatch this little nugget was near the top of the list. As the poster said it might just be Google doing some simple housekeeping. Then again in might just be the start of Google's payment system.
So if I take the view that Google are about to do something the the payments world and also make the logical deduction that Google were a major player on T-Mobile's new Web'n'Walk service, could that also be why SIM-PAY failed? Maybe I have been reading to many Grisham novels.