As you've probably read by now, 30MB versions of the Zune stopped working everywhere around 1:30am early this morning. It's a good reminder that companies need to think about what happens when the cloud goes down. Some say "but local servers go down too." True, but in a DR setup, your environment can withstand losing one datacenter. I know, I've architected a DR site that kept running when one datacenter was lost due to massive power and generator failures following a hurricane. Usage of the cloud needs to be thought of in those terms. You can't rely on just one cloud -- or else expect your business interruption insurance to go after your forced to a file a claim.