I would not want such a device, but not because of the big brother aspect. I simply do not see how its any more convenient.
Besides, if you had a chip in your hand/arm...you escalate the violence necessary for identity theft.
In the past, you might get your purse snatched. Now, they have to cut off your hand/arm.
As for Warbler's comment about being 'borgafied'...depending on the application of other cybernetic technologies, I would not be opposed to taking advantage of them. as a couple examples, the idea of artery-cleaning nanotechnology is very much appealing. External muscular augmentation (one of those suits that is mimics to your movements and helps do the work) would be very interesting, and if they could develop sensory implants to increase your visual range (imagine seeing a flower in the ultraviolet spectrum the way a honey bee does) and auditory ability, I might be there. Linking to a computer and controlling it with my mind, that would be very interesting, but I'd definitely make sure it was a non-internet equipped machine.