Dude, they are the same movie, just one is remasterd and the other isn't. If Lucas had the OOT remastered, it would look the same as the SE DVD's, just without the newly added scenes.
It is scary that Lucas has duped a whole generation in thinking that the OOT actually looks like shit, and the SE looks great on DVD, when they are from the same negative! If you want a good example, buy the ET DVD, you have the Original Version and the Special Edition Version, both transfers look the same except for the new footage added in the new version.