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It's a matter of cost (as already mentioned), but also limitations in the technology. Different materials can reflect or absorb the signal. This causes a lot of problems; especially for automatic checkout situations.
Some large retailers like Walmart had some high hopes for RFID when RFID was the hype. Unfortunately, they didn't have an understanding of the requirements or limitations of the technology. For example, they had a ridiculous expectation that a pallet of any material could have a 100% read rate at 100 ft/minute if my memory serves me. There are things you can do to assist in the read accuracy such as air gaps (in and out of the container), spacing, label placement, reflectors, et al., but its difficult and expensive to manage and test.
Inventory management or asset management is a good fit. You could put an RFID tag inside a computer and place readers to cover what you need. That would allow you to define areas where the computer is allowed to go. Not physically obviously, but as an additional level of security. Whether the expense is worth it depends on how many areas you're going to manage. Basically you'd assign antennas at every portal you needed to track. And the number of readers required would be based on that and distance since the cabling can only be so functionally long.
I think they could be quite useful at home: for example, helping you know the name of the person you awoke sleeping next to, without the embarrassment of having to actually ask them.
Or, helping you remember your own name, when you wake up in a place you believe you've never been in before.
"We live in a world ruled by fictions: mass merchandising, advertising, politics as advertising, instant translation of science, technology, into popular imagery, increasing blur of identity in realms of consumer goods, preempting any free, original, imaginative, response to experience by the television screen. We live in an enormous novel. For a writer it's less necessary to invent a novel's fictional content: fiction's already there. A writer's task is to invent a reality." J. G. Ballard, 1974
One thing I have noticed about the latest 4.2.x updates is they have tweaked the camera app significantly.
They now have a new rotary on-screen setting thing, but most annoying of all is they have binned the post capture thumbnail.
The thumbnail that used to appear gave you a quick access straight to the image in the gallery, to then access the share/delete/etc. type actions.
Now, I have to back out the camera app to the home screen, select the gallery, then select the gallery folder containing the photo, then select the photo. It just kinda sucks now.
So, surely they can't think this is an improvement, or am I missing something?
I have an Android 2.3 HTC Wildfire S (That I wouldn't recommend to anyone, ever) and I have had to install pretty much a replacement for every default program on the phone, including the SMS messaging one!
In all honesty, I never thought I would say this, but I've been going off Android a lot recently and I've used an IPhone a few times and I have to say, the UI is less cluttered and doesnt lag like all the Android phones I've seen, including the Samsung Galaxy 3 which is supposed to be quad core