Informational links:

• TheLightsaber.com (Luukesabers)
• Wikipedia Lightsaber Article
• Glossary for lightsaber prop terms

Lightsaber Replicas and "Beauty Props":

• Force-FX (Master Replicas)
• Pasksabers.com (EL-blade sabers)
• Illumisabers.com (one-of-a-kind sabers)

Stunt/prop Lightsabers:

• Ryan Wieber's Sabershop.com
• RandomSabers.com (they sell acrylic and carbon-fiber blades, as well as make custom machined hilts)
• Gaffer's Tape for your blades
• Aluminum tubes, another blade alternative
• Pastor Jedi Sabers (sells parts as well as props)
• The Custom Saber Shop (sells parts kits)

Build your own Lightsaber, How-To Instructions:

• The "Hero Stunt Saber" (Apocalyptic Productions)
• Big Yellow Box (beauty props built from plumping parts)
• "Build your own Lightsaber"
• Kin Char Bamin's "building your own lightsaber prop"
• Padawan's Guide - Lightsabers

Lightsaber Choreography and Combat:

• John Clements "Fighting with Lightsabers" (he's a professional historical swordsman, not a choreographer, and has some great insights)

Costuming:

• Jedi Knight Costumes
• Ravensmoon Replicas