Not too keen on the actual app but really interesting ways of displaying what they are doing.
Core Mobile App Landing Theme by Pierre Marais, via Behance
Gready - An Easy To Use App and Landing Page - HTML / CSS on Creattica: Your source for design inspiration
Unique Web Design, Line Mall #WebDesign #Design (http://www.pinterest.com/aldenchong/)
Focus - Free PSD Landing Page Template #app #website
PSD Template - RocketApp Responsive App Landing Page