Deleted and cut scenes are very well chronicled at these websites (not only for the Original Trilogy, but for the Prequel Trilogy as well):-

http://www.starwarz.com/tbone/cut_scenes/ep1/ *includes info on 'The Lost Cut'

http://www.starwarscutscenes.com/

http://starwars.rossiters.com/

http://www.blueharvest.net/

Sites which feature the many different releases, and their varying formats, of the OT and PT over the years are featured at:-

http://www.davisdvd.com/misc/ep1.htm

http://www.blam1.com/StarWars/