Just read this article on the many "restorations" the OT has suffered:
http://secrethistoryofstarwars.com/savingstarwars.html
Quite interesting, though I suppose some of you have probably already read it :)
After reading this article it becomes apparent how much of a cockup Lucas has done to these movies! It almost makes you want to call the movie protection agency to take the movies away from their abusive father.