Today's computers operate using transistors, wires and electricity. Future computers might use atoms, fibers and light. Personally, I don't give a byte what makes it tick, as long as it does the job. If I could accidentally spill my coffee and not have it cost $848, that would be a cool feature.
But let us assume that you are not still bitter from a recent laptop replacement. You might stop to consider what the world might be like, if computers the size of molecules become a reality. These are the types of computers that could be everywhere, but never seen. Nano sized bio-computers that could target specific areas inside your body. Giant networks of computers, in your clothing, your house, your car. Entrenched in almost every aspect of our lives and yet you may never give them a single thought.
Complete understanding of the theories behind these future computer technologies is not for the meek. For example, my research into quantum computers was made all the more difficult, after I learned that in light of her constant interference, it is theoretically possible my mother-in-law could be in two places at once.
If you have the heart, take a gander at this collection of articles and links on the most promising new computer technologies. If not, dare to imagine the ways that billions of tiny, powerful computers will change our society.