Star Wars D6 was the first major RPG for the Star Wars setting. A lot of the material for the game was of such high quality that Lucasfilms considered it canon and some of the material was used in the Expanded Universe novels.
D6 Holocron- Has an amazing wiki of game material and downloads of every Star Wars D6 product ever.
Wookiepedia- Another great wiki, but focused on the source material, not the game.
Excel Character Sheet (with more room for Force powers): Character sheet
Galactic Maps (high resolution, zoomable (is that a word?)): Maps
Reference Guide: Reference Guide