Check out this video from Chemical Reaction Tutorials (CRTutorials). If you love filmmaking, prop making, editing and everything else that goes along with making movies, then you'll want to see what Adam has to say about lightsabers.
Kevin from Shudder Pictures shows you how to create the lightsaber effect in Adobe After Effects. Making your own light sabers from Star Wars in After Effects is the quickest and easiest way to making your Jedi fan films.
Get the file here: http://www.videocopilot.net/tutorials/light_sabers_v2