In terms of youtube, soundcloud, twitter etc integration, it would be awesome to be able to subscribe, follow or tweet for a tagged non profit DL. I know it's important to get emails, but at the same time, gaining youtube subscribers or getting a social media blast would be a nice option as well. I personally rather make my free DL's collect youtube subscribers and my use coupon codes and discounts to collect emails.
I hope this can happen soon!
...not gonna lie, I do like the visualizer. Seems simple to implement. Everyone's biting off of you, might as well nibble a little off of them too.