Maps and Printed Guides

• Blackwoods Press - Maps and Guidebooks
• MyTopo - Custom printed topographical maps
• Tom Harrison Maps - Very nice full-color, shaded relief topo maps for California areas
• California Rail Maps - Detailed maps and information on California's rail system.

John Muir Trail Related Resources

• JMT Yahoo Group - Probably the largest 'socially' collected trove of JMT related information.
• JMT Facebook Group - Nearly 3,000 members (at this time) and growing strong.
• PCTA JMT maps and books page - The Pacific Crest Trail Association's maps and books page dedicated to the JMT. Includes high-resolution JMT trail elevation profile with labeled peaks and way points.

Pacific Crest Trail Related Resources

• Pacific Crest Trail Association Official Site - Give them your money, donate now.
• Halfmile's PCT Maps - Current and accurate Pacific Crest Trail maps.
• Halfmile's PCT Cell Phone and Wi-Fi Information - Halfmile compiles a list of cell phone reception and wi-fi availability reports, linking them here.

Raw Materials/MYOG (Make your own gear)

• Outdoor Wilderness Fabrics - Supplier of outdoor fabrics and hardware (zippers and rings and snaps and such).
• r/MYOG - a Reddit sub-reddit with discussion and links relevant to making your own gear.
• LytW8 Free MYOG Plans - Jaime makes his own gear, documents the processes and puts PDF's up with plans and instructions.
• Make your own stove - There's a million pages/links/videos out there explaining how to do this. This is one of them.
• Ray Jardine - MYOG kits, plans and trip reports.

Trail Food

• Packit Gourmet - Pre-packed trail meals, general grocery, cooking gear and meal planning.
• r/TrailMeals - A Reddit sub-reddit devoted to outdoor food enthusiasts.
• Wilderness Dining - Wide variety of backcountry food options.
• Trail Cooking - Recipes, how-to's and buyer's guides for all things trail cooking.