Research firm IDC forecasts mobile app downloads are on pace to surge from 10.7 billion in 2010 to 182.7 billion in 2015. But apps will remain an obsession only as long as they continue to captivate, surprise and entertain consumers. Fortunately, the app ecosystem shows no signs of slowing up: Innovative and immersive mobile experiences are entering app stores every day. Each month, FierceMobileContent looks at the best and brightest, spotlighting the new apps that no smartphone should be without. Click here for the most compelling mobile apps of July 2011.