Music- I love to use classic music that wasn't actually written by John Williams, but sounds like SW music.
-If you are extending the nightmare sequence in Ep. II as I am, check out "Tapiola" by Sibelius, 15 minutes, 30 secs into it. There are also a couple good dramatic cues at around 11:15 and 12:15.
-"The Planets" by Holst sound a lot like Star Wars (part of it has been used in the temp tracks, which might explain that). "Mars" is good in particular.
-Another good one by Sibelius is the first movement of the Karelia Suite- I've found that that makes a perfect ending for Phantom Menace, instead of the juvenile sounding original. I synched it with the ending footage to see how it would work (out of curiosity), and not only did it have a completely appropriate build and crescendo (presumably to the end credits), it was the correct length, and not only that, it climaxes to the exact key on which the end credits begin.
Not sure if you wanted music advice, but I hope that helped in that department.