I love the simplicity of it. Don't be compelled to succumb to feature creep. There is already plenty to make people pay five bucks or more a week for this. The worth to movie, music, and videogame producers alone.

I guess you could add some mobile notification mechanism, but I already love the product as it is right now.

As far as I am concerned, you might as well charge twenty bucks a month for it. It's a great product.