djs: We had a developer with his own laptop PC. I'm not site support, so it's not my business... but I agreed with IT, it pissed them off to no end. That said, depends on the business. This is a huge BPO, it *has* to be secure as there's credit card / personal info being dealt with. If it were a small design company or something (50-200 users), I'd have no qualms using my tablet for stuff.
(I'm seriously a huge proponent of Linux... but as much as I'd love to see it at work, I'd hate to as well.)