Links
New England Weavers' Seminar
Handweavers' Guild of America
Complex Weavers
American Tapestry Alliance
Weavezine is no longer active but the site archive is still available
Fiberarts listing of guilds and resources
Huge collection of drafts (includes AZU's collection and more). Annual $20 subscription allows download of .wif files
Ravelry has a large and growing weaving community
Facebook has a number of sites devoted to weaving. Look for "8 and counting", "The Weavers Marketplace", Weavetech and others
Sources
WEBS
Northlight Fibers (Call before making a trip to Block Island)
Sewing resources