Magazines and webs: Boulderdash, Climbing, Couloir, Desnivel (spanish), Mountain Online, Expedition News, Outside Online, Rock & Ice, Mountain Zone, Vertical.
Manufacturers : A5, Arc'teryx, Beal, Bibler, Black Diamond, Blue Water, Camp, Cascade Designs, DMM, Edelweiss, Esprit Ropes, Feathered Friends, Fish, Gore, Grivel, Integral Designs, Lowe Alpine, Marmot, Metolius, Misty Mountain, Mountain Hardwear, Moss, MSR, Omega Pacific, Outdoor Research, Patagonia, Petrogrips, Petzl, Pika, PMI, Roca, Sierra Designs, Solstice, Stone Age, Stubai, Trango, Ushba, vauDe, Wild Country.
Boots and resoles: Asolo, Boreal, Five Ten, La Sportiva, Merrell, One Sport, Red Rock Resole, Raichle, Salomon, Scarpa, Tecnica.
Holds and walls: Ascent Products, C.R.A.G, Griphead, Netrock, Nicros, Pusher, Radwall.
Retailers: Barrabes (catalan), Black Dome, Campmor, Exkursion, Mountain Equipment Co-op, Mountain Gear, Mountain High, Mountain Tools, Theoutdoor.com, Redpoint, REI, George Fisher, Rock and Run.
Organizations American Alpine Club, AAC Sierra Nevada Section, Alpine Club of Canada, British Mountaineering Council, Mountaineering Council of Ireland, UIAA, American Mountain Guides Association, American Mountaineering Foundation, Mountain Rescue Association, Wilderness Medical Society, The Mountain Institute, Mountain Forum, Himalayan Explorers Club, Junior Competition Climbing Association.
Local (western PA, USA) stuff: Explorers Club of Pittsburgh, Todd Mummerts local info, Tim Anderson's page.
Legal stuff: Wilderness Act, Pennsylvania Recreational Use Statute.
Analysis of a fall.
Humor: Al's home for silly stuff (unpopulated), The double gated carabiner and other cartoons, Dr. ACSII.
Other links: The Climbing Archive, The Climbing Dictionary, ORCA/ CSG, gym search, Cords & more, Weather, Ropers Knots Page, Climbnet, AMGA, Wayne Trzyna's Ice, Quang-Tuan Luong, Distilled Wisdom from The Mountaineers rec.climbing.
By the way, climbing is dangerous - consider yourself lucky if you walk away with nothing worse than a broken finger.