http://www.prodigy-pro.com/forum/index.php

www.singlecoil.com
www.generalguitargadgets.com
www.diystompboxes.com
www.geofex.com
www.diyguitarist.com
www.runoffgroove.com
www.tonepad.com

PCB Manufacturing:
www.expresspcb.com
http://www.olimex.com/pcb/
http://www.pcbonline.org/

AMp Hookup wire 20ga 600V
http://www.mcmaster.com/ page 720
http://aircraftspruce.com/catalog/elpages/shieldwire.php
http://apexjr.com/

Avoid Silver plated copper.

Case Hardware:
http://www.reliablehardware.com/

Speaker Drivers:
http://www.mcminone.com/
www.mcmelectronics.com

Cheap Pedal Parts
pedalpartsplus.com
www.smallbearelectronics.com

Toroids
http://www.toroid-transformer.com/
http://www.antekinc.com/
http://www.piltron.com/

REverse Log Pots:
http://www.audiomaintenance.com/home.htm

Cheap PCB's:
http://www.goldmine-elec-products.com/prodinfo.asp?number=G15698
www.allelectronics.com