A good place for comparing…IMO it was SO MUCH BETTER left untouched, and this showed me just how crazy Lucas is…some of the things he took the time to fix were completely pointless:
http://www.starwars.com/episode-iv/release/video/f20060825/index.html
Mod Edit: Unfortunately the website linked to above is no longer around. However…
StarWars•com Official 2004 Changes Preservation : SW : ESB : ROTJ - re-uploaded & compiled by doubleofive
The Internet Archive’s WayBack Machine has working functioning links for the site re the 1997 SE changes, here:-
http://web.archive.org/web/20110623222820/starwars.com/episode-iv/bts/article/f19970115/index.html