MusicReader is a great way to diplay pdf files that you can then easily put in different playlists.

On my desktop PC I create pdfs of Sibelius sheet music by using the musicreader print driver. Then sync it to my iPad. The quality is outstanding. I also create talking points and message outlines in Word and then save as a pdf into the MusicReader folder on my PC. Then when you open MusicReader it automatically adds the files to the library.

Great solution, well worth looking into.