Okay, so this isn't Prequel related, but I didn't think this deserved a new thread:
I think it's probably well known that John Williams' various scores from around the same time period all feel similar (Raiders & ESB). It's also pretty well known that, when ET sees the kid dressed as Yoday, Williams inserts a bit of Yoda's theme.
http://www.youtube.com/watch?v=VrVEHszxL7E
But am I wrong in thinking the music before that (starting at 1:35 in the above video) sounds like a happy version of Jabba's theme? Jabba + Ewoks, if you will.