McAfee says mobile viruses happening now.

"Lastly, a concession: despite the mountain of FUD, it is true that the increased capabilities of Smartphones, and their open OSes does mean that they will eventually become a target of attacks. But there is no good reason to lie, and say it happened yesterday just because it may happen tomorrow. For now, the biggest problem with security is actually lost or misplaced devices, NOT hacked devices. That's why enterprise-grade service providers like RIM and Good have 'remote self-destruct' features."