The US Subpoena
Google docs has all of your business work and the US government or some Google competitor goes on a fishing expedition and requests every single document in Google Apps. The US courts support the application and without notification all of your business documents go to a third party.
At least of you host your own data, the courts has to tell you that they want your data and it will be because you are already involved in the case.
I wouldn't touch Google Apps unless they allowed me to configure their interface so that the data never left my networks. I read in the Reg that US courts have ruled that even data in RAM is in storage and is subject to the discovery phase of a court case. If it touches a Google server it is as good as in the public domain.


