The other bit of good news, at least about handhelds' effect on security and compliance, a lot of healthcare companies are migrating to iPhone-based apps for doctors and nurses, even for HIPAA-regulated patient records. Clinicians walking around patient floors use them to read or write orders for tests, test results, symptoms and care reports. Some studies show a higher rate of misdiagnosis and mis-prescribing of tests or medicine by doctors with handhelds, but that has to do with how the data are laid out, not problems with either the concept, use-case, hardware or security involved.
Back to the bad news -- those results and the debut of Windows 7 on phones will make it harder to argue that the iPhone and Android phones are alien operating systems that require a completely different skill set, management, security and auditing tools than PC-based operating systems.
That's all true, but it's not going to help when users want to be able to use technology as smart at work as they do at home.