I've also always wondered this. Also, why doesn't anyone say the word Padawan? I mean, like... I would expect it to come up at least ONCE in the OT... Like, maybe Obi-Wan would say it to Luke or Darth Vader to Obi-Wan or Yoda to Luke or SOMETHING!

I think this is just more proof that George Lucas didn't have the PT written way back when he first made the OT... Also, what the hell was he doing in that, like, 20 year break or whatever between the OT and the PT? I mean, he obviously wasn't writtin the PT, or else there wouldn't be so many plot holes and inconsistencies!