I can see it as being useful for blind users who are also deaf. For folks who are simply blind, however, the iPhone and iPad are awesome. I run a iOS developer group and devoted one meeting to accessibility on iOS. Several blind users were kind enough to show us how stunningly cool the platform's VoiceOver feature is and it's importance in their daily lives.
VoiceOver not only allows you to navigate through apps and use the phone/pad like anyone else, but it also reads text on the web, in iBooks, etc. One user shared how the phone's built-in compass and maps features gave him the freedom to roam the city in a way he couldn't have imagined before (without spending many thousands of dollars on much, much clunkier hardware and software). One user passed along a joke from the pre-iPhone 3Gs/4 days: how many people does it take to help a blind man across the street? Two; one to guide the blind man and one to push his shopping cart full of assistive aids.
Video demonstration of the feature:
This video demonstrates how it works
The video towards the bottom of this page is Apple's instructions on using VoiceOver under iOS.
A video of user Justin Mann at the user group meeting I mentioned, explaining how it works for him and why it's important.
I wasn't aware of VoiceOver. Interesting concept, I imagine. Without it, the iThings are pretty much useless to blind people (why buy a piece of flat plastic that you can't feel buttons to press to dial).
Based on the wording in the iSense video, it almost seems as if they were unaware of it as well, based on their premise that blind people were left out on the iThing.
Sadly, the iSense is just a video, made by some people with the means to make a slick video, but not the means to make the technology.
A real iSense screen would likely be built into the product, not a material made of Unobtanium that is laid over the existing screen.
Additionally, given that neither iPad model has a means of recognizing "what's on top of my screen", this is just imagination-ware.
Why am I being harsh on it? While we can hope it inspires somebody to solve the problem, it's a "duh!" idea. It's a slickly packaged promo for an idea that is inherently obvious to anyone versed in the art (the definition of what is/is not patentable).
A while back, the last time gas prices spiked, a friend of mine lamented "somebody needs to solve our dependance on oil." This struck me as lazy-wishing. Instead of whining about it or mastering the craft of making slick videos, why not go to school, and learn how to solve it themselves.
Furthermore, as with older iPhones, the battery lifespan was about 18 months average. My 3g was good for the 2.4 years I had it, but I could tell the battery wasn't lasting as long. I assume the newer models have batteries that live longer, but still, as an embedded component, it's a driver towards replacement.
I'm not trying to sound dense here but I have a G1. the battery went dead. I bought a battery, opened the case and popped it in.
Are you saying that's not possible with an iPhone?
iPhones have no battery door and so no, the battery isn't officially user-replaceable. They'll do it at an Apple store pretty cheaply, but not as cheaply as doing it yourself. You can do it yourself on the iPhone, it's not hard, but it does require opening the case with a screwdriver, etc.
About 1/3 of Android phones are the same, no battery door, and the percentage seems to be going up. Same deal with them, though: you can do it yourself, it's just not slide-pull-push-slide like a phone with a battery door.
Loving the battery life on the iPad 2 so far.The lack of battery door also means that the whole device becomes more solid, to the point where the iPhone 4 doesn't flex at all. To me, anyway, it makes it feel more... advanced, I guess, more futuristic. And more valuable.
My 3Gs has been in constant daily use for 20 months now and still has a charge that comfortably lasts all day and evening. A few apps -- intensive games, mostly -- can run it down faster than that, but it's almost never an issue. If it keeps up until the new iPhones in (likely) September then the lack of battery user-replaceability won't have affected me at all.
I've been using my iPad 1 continuously for 14 months and it still runs for 8 or 9 straight hours of constant use (and many days of casual use), so it's not an issue there yet, either.
So far I'm quite happy.