How long will it be before the norton, mcafee and avg's of the world start developing and selling anti virus and spyware programs tailored for the smartphone market?

As a small business owner running windows across 15 laptops and a server I can personally testify to the huge business cost of keeping our network safe. It's literally a couple of grand a year minimum.

The issue I see here is that I spend all that money keeping the office network safe but we could see data, confidential leaks and virus threats from our phones. I've issued all of my employees with smartphones (mostly blackberry). These phones are hooked up to our office network through laptops on a daily basis.

Will Norton on a laptop detect a virus or trojan on the smartphone or do I need a whole new security protocol running on our smartphones to have some gaurantee of security across every aspect of our network? And at what cost?