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Just had another thought. Obviously you can't cover the world in solar panels, but if you built a huge array in space, or a collection of smaller ones, you could just transfer this energy wireless to earth. So maybe in a hundred or two hundred years if we haven't figured out fusion or killed each other that might be viable.

The only thing I question from the list is the tablet pc. I see great potential in this area for the future and it is already popularly used in the school and medical arenas. Also, if you look at the most recent Apple innovations you notice a heavy emphasis on touch interfaces, including the iPhone, iPod touch and new macbooks. Even Windows has some concept systems where you just set your camera/phone on top of the screen and the pictures automatically upload and then you can use your fingers to play around with the pictures. I do understand that right now the tablet pc isn't popular -- it is too expensive a toy (usually at least $2,000) for many to buy when you can buy an equally equipped laptop for less than half that, not to mention that fact that the technology isn't fully developed. If any company really is going to capitalize upon the possibilities, it will be Apple. In fact, if you look at the patent filed for the touch interface for the iPhone it pictures a tablet pc and not a smaller device like an iPhone or iPod. The point it, technology evolves. The mouse once had a rollerball, then a scroll wheel, then a laser... One day we very well might be saying that same thing about the laptop. It once was big and heavy, had a whole separate keyboard, etc. Really, to keep innovating, what are these companies going to offer? They throw in a few extra ghz, a larger hard drive, etc. but there comes a point where we just don't utilize all that stuff and want something more innovative and fun. Maybe the tablet pc does die off for a time, but I fully expect it to be resurrected at some point in the not so distant future.