FAQs, Help, and Tutorials

About.com: Before You Buy a Mountain Bike - A Buyers Guide
Practical advice on factors to consider before buying a mountain bike.
http://mountainbike.about.com/od/buyersguideandreviews/bb/bike_BYB.htm

Biking Articles by Sheldon Brown and Others
Technical articles about bicycle maintenance for both mountain and road.
http://www.sheldonbrown.com/articles.html

Chain-suck in a Nutshell
Jonanthan Levy details the causes and mechanisms of chain suck and how to avoid and prevent it.
http://www.fagan.co.za/Bikes/Csuck

The cycle shed
Single speed, wheel building, t-shirt printing, yorkshire (UK) based stuff.
http://www.thecycleshed.co.uk/

Go Tubeless
Offers how-to guides, product reviews, news, and user contributed information about using tubeless tires for mountain and road biking.
http://www.gotubeless.com

Mountain bike mailing list faq
Extensive FAQ compiled and appended by members of a mountain bike mailing list.
http://www.faqs.org/faqs/bicycles-faq/mountain-bikes/

Mountain Bike World
Information, guides and reviews on mountain bikes and mountain biking. Includes parts, accessories, maintenance and technique.
http://www.mountain-bike-world.com/

Singlespeed Mountain Bikes
Many cyclists are rebelling against the excessive complication, fragility and weight of current mountain bikes. Discusses move to using simple, one-speed bicycles.
http://www.sheldonbrown.com/singlespeed.html