Ultimate How-To Guides

So I was playing around on boingboing today and stumbled on a How-To Guide for making catnip extract and while that was funny it was not horribly interesting but the website that hosted it is wonderful.
Instructables is a website were the denizens of the web can post their own How-To guides for the rest of us to peruse.
The best ones I found in a few minutes searching are as follows:
How to Build a Tetris Bookshelf
Lightsaber for $33 in 33 minutes
DIY Pocket Protector
Scale Wooden Crossbow
Gasoline Powered Soda Bottle Rocket Launcher
Look those over or find your own or even better write some guides.