"LineUp App - Get a new phone number for your iPhone/iPad in 30 seconds or less"
http://news.ycombinator.com/item?id=4585832
Sadly there was no response whatsoever from my Show HN, but LineUp has been profitable since launch (minus my time/effort), gains about 100 new users per day, and was recently featured at TwilioCon in the Community Hall. I'm currently working on the UI/UX and the next big push for users, but have a few other things, like my actual job, getting in the way.
Any suggestions/feedback are always welcome!