From a whole website devoted to cool stuff--Smart Stuff--here are a couple really cool stuffs:
Speed laces: Never tie your shoe again. I hope these work, and if they work, I hope they catch on.
The Water Cone: You can't buy this thing, but you can apparently purchase the product. That is, they are looking for someone to buy the patents and trademarks in order to make a bit of money. What it does is use the power of the sun to desalinate sea water, rendering it suitable for consumption and, presumably, very small scale agriculture. Never let that potted plant die again!
Inscribed by Jason at 4:12 PM