Craftster.org - Organized Swaps - http://www.craftster.org/swapsinfo.html
A forum that gives tips and details on craft swaps. Has a list of moderators and an introduction to craft swapping.
Fiberarts.org - http://fiberarts.org/
Provides a list of guild contacts as well as general articles on crafts and crafting.
Yahoo Group: Crafting For A Cause - http://groups.yahoo.com/group/CraftingForACause/
Non-profit crafter group for charity. Create craft items for patients in Sacramento and Lakota in South Dakota.