Climbing gear Clothing Other Resources Dirt Rag Mag . Dirt Rag is one of the best mountain bike magazines that I've read. They have quite a bit of other stuff as well, so take your time and look around. ARA list archives . ARA runs a mailing list dedicated to adventure racing.
Conversation ranges from race tips, equipment and training questions, upcoming events, etc.
You can subscribe here or just browse the archive of articles. Some gems of info sprinkled here and there. Books Scott Tinley's Winning Guide to Sports Endurance . This is a great all around book. It's set up into five parts.