What is your favorite piece of technology?

[skateboard]

For me, it is the calculator on my handspring visor. The area and length features are very usefull for metric/foot calculations. I use it a lot, I enjoy it, I still have things to learn about it.

My pleasure is juiced by childhood memories. I remember hearing about the first hand held calculators before they came out. "They cost a thousand dollars!" my first grade buddy told me.