Costuming Supplies:
Would You Believe - Ben Nye body paints
The Monster Makers - Latex and mold supplies
Dharma Trading Company - Clothing blanks, material, and lots of dyes
FX Supply - Body paints and mold supplies
Tandy Leather - Leather, leather dye, and lots of other stuff!
Hobby Link - Airbrushes and travel size air compressors
(I use the Blue Ice compressor and the Aztek A220 airbrush.)
Reel Creations - Reel Creations Alcohol Based Body Ink
Cosplay.com - Costuming supplies ranging from top quality to cheap.
Research and Tutorial Sites:
The Padawan's Guide - Info for many Star Wars characters.
Image Events - Great Aayla tutorial, and others, too.
Studio Creations - No Twi'leks, but good costuming information.
Wermo's Guide to Lekku - Summer's Tutorial for creating fabric lekku.
The FX Lab - Special effects prosthetics and makeup forum.
Star Wars Costuming Clubs and Fan Sites:
The 501st Legion - An international club for Imperial and villian costumes.
The Rebel Legion - An international club for Jedi and Rebel costumes.
The Jedi Assembly - A group dedicated to Jedi costumers.
The Force.net - Star Wars news, info, and a great costuming forum.
Replica Prop Forum - The RPF is one of the largest replica prop sites.
The Dented Helmet - Mainly for Fetts, but other costumes are discussed, too!
Lightsaber Forums and Websites:
Ultra Sabers - Sabers, conversion kits, and supplies. Forum, too!
Plector Labs - Luxeon saber supplies and tutorials.
Illumisabers - Tutorials and custom sabers.
Custom Saber Shop - Saber kits, supplies, and a terrific forum.
Random Star Wars Websites:
Rebel Scum - A site for Star Wars collectors.
Star Wars - Lucasfilm's "Official" Star Wars fan site.
Sir Steve's Guide - Steve Sansweet's Collector's website.
Wookiepedia - The Star Wars Wiki Encyclopedia
Jan Duursema - Jan Duursema's comic website and forum