Without question, in the enterprise. Mozy, an online backup service provider, and Compass Partners recently completed a survey that found a growing number of professionals working remotely and relying on personal devices. Cisco Systems has seen its BYOD program grow 52 percent in 12 months, with employees collectively carrying 8,144 iPads and 20,581 iPhones.

Nevertheless, Cisco is a behemoth company that lives on the bleeding edge of technology; most companies are in the early throes of BYOD, which usually begins life in the enterprise as part of a larger mobile strategy. Giant pharmaceutical company AmerisourceBergen, for instance, recently kicked off its BYOD program for some 1,000 employees in its corporate and drug business units.

"It's really a combination of technology and policy," says John DeMartino, vice president of IT infrastructure and technology at AmerisourceBergen.

For CIOs, BYOD can be a nightmare. Avanade, a business technology services firm, which surveyed more than 600 IT decision makers late last year, discovered something rather alarming: More than half of companies reported as a result of consumer gadgets.