One thing I've recently been made painfully aware of is sovereignty issues when it comes to cloud computing. I'm specifically referring to a situation where a consumer organization - let's say for the sake of argument that we're talking about a Canadian company - has restrictions on where it's data and services can physically be in terms of geographical locality. When the IT services you consume become abstracted from something you can physically see and understand, things get a lot more complicated and of course there are a lot more opportunities for failure ...