Basically, the whole of YouTube is a grey area.
Tom B, don't use the soundtrack, especially not just because someone else did. You'll get into trouble - your video will either be taken down or muted.
Drannion Entertainment, YouTube's a grey area. Yes, it's a fanfilm, and you can make money through advertising. Having Star Wars in the name appears to be fine, as there are people who make lots of money on the site through fanfilms, just as long as you don't use any audio, video or graphics that is copyrighted.
It's not a precise science, and there doesn't appear to be a cohesive rulebook, but it's the best we've got. Hope this helps!
"Nothing goes down 'less I'm involved. No nuggets. No onion rings. No nothin'. A cheeseburger gets sold in the park, I want in! You got fat while we starved on the streets...now it's my turn!" -Harley Morenstein