Give people time, a pencil, and a sharp knife, and amazing things can happen. Check it out - Pencil Carving.
I especially like the ball-joint one in the "To see our wroks" link. Simply amazing.
Problem is, now I want to try.
Coolness rating: 9.5

Want to get your game on? Robo-style? Check out this Soccer playing robot. Very cool.
Coolness rating: 7.5

Chernobyl

Wow, this is really amazing. A pictorial tour of Chernobyl, or as she calls it, GHOST TOWN, given by probably one of the few people willing and able to do it. Quite amazing.
Almost 2.4 million people have seen this site, but since it is hosted on angelfire, sometimes bandwidth limitations shut it down. As such, I stripped the whole site (using WebStripper) onto my computer. The whole site is just under seven megs, if you want to get it yourself.
Rating: Simply Amazing

Okay, this is truly one of the coolest things I've found on the web. It sounds funny, but The Rasterbator is sure to provide a cool new look for one of your walls. Ever wonder how they get those big pics that cover entire walls? Well, here's your chance to get one of your own. Enjoy.
PS - Mail me a pic of your wall when you get it done. I'll try to post mine soon.
Coolness rating: 10+
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UPDATE - Okay, here is a sample of a rasterized pic. It's a tree stump I found in Yosemite. To get an idea of the size, each square is a regular sheet of paper. I'll post another pic when I get it and the other ones I made put up in my room.