I use Goodreader file manager app, it generally allows me to rename files on the go so I can create a new list, move them to different folders.

What I would love is an app that you dump your tracks into and then can create multiple setlist, without duplicating files. Theoretically the default Music app can but it's clunky, and I'd rather copy music to an app instead of the iphone directory.

@Rob, with Jamzone you can't use your own tracks right? It's kind of like an ios BIAB eh?