Of course, the object of the game is to find ones with good enough beginnings to work as notifications, but it happens that the ones I've chosen are such good songs that I sometimes let them play all the way through, just for the pleasure of hearing them. LOL
I use Ringtonium Pro. I really like the ease of editing and clipping audio clips to get exactly the section of a sound track you want to use as well as the ease of installing the ringtones so it is easy to find them.