I can never decide which of the three films I think has the best music--they're all great, in their similar-yet-different way. I love how each film has its own distinct "feel", all recognisably SW but unique in the particulars of the style.
My pet project the past few months concerns the background music--the parts that are quieter and less noticeable, generally not containing the main themes, or only faint renditions thereof. I'm editing sections of music together, finding ways to combine them so it sounds like they'd been composed that way to begin with, into tracks of four or five minutes each. So far I've got about an hour's worth; once I get around 75 minutes it'll be burned to cd. I'm having a lot of fun with that, but it's time-consuming and hard to get it to sound exactly right. People I've told about it think I'm nuts, I think, but hey. lol
The idea for that came from the game Jedi Knight--there are cd tracks in the game containing heavily-edited together sections of the film scores, mostly the background stuff. I like the SW ambience feel that you get from that.