
Park tool has a pretty some good how-tos on fixing your bike: Getting the length of your chain or brake line right, installing a new set of tires, etc... Link.
More:

Bicycle projects & more @ MAKE - Link.
MAKE 11:

Our special "DIY Wheels" section brings you plans for making a mobile drive-in movie theater, a cool chopper out of an old bicycle, and a pedal-powered iPod charger. We'll also show you how to make a remote control bird feeder to take amazing photos of birds, a vintage-style remote control race car out of sheet metal, and a vacuum former that lets you create molded 3D parts out of plastic. These articles are just the tip of the iceberg in this project-packed volume of MAKE - Link & subscribe ($5 off link!).
































One other thing (I can't see the article, as it's dead) but a lot of bikers have gone 'tubeless' recently.
the best one (IMO) is the kit from www.notubes.com
Easy to install, and also seals leaks up when you are out on the trail.
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