Community Links

http://www.nerfhaven.com

The most active Nerf community on the web

http://www.nerfhq.com/smf2/index.php

An old forum which still has lots of old content available. 

 http://mostlyharmlessforums.boards.net/.

Mostly desolate forum of Kane's creation.  Intended for all toy guns.

Suppliers:

http://www.mcmaster.com/

They have damn near everything.

http://flexpvc.com/

1/2" PVC Wyes, and TONS of cool PVC connectors you didn't know existed.