It's very sad but I confess to liking sounds in software. I wonder if MLO Desktop and apps would benefit? I've been using Wunderlist for shared grocery lists with my wife and I just love the satisfaction of hearing the little ding when I complete an item (sound file attached if you're curious). I was listening to a technology podcast recently with several industry hardened tech journalists and they were discussing Wunderlist. They said exactly the same thing about the strange pleasure of hearing the completed sound.
Trivial possibly, but then UX shouldn't be underestimated.