NileGuide, one-stop travel planning site, has launched an new iPhone app, called What's Next, geared towards travel recommendations. The startup, which lets you create customized trip itineraries is integrating location-based technology with What’s Next to offer personalized, and interactive content and recommendations in the app, which costs $2.99 on the App Store. What's Next aggregates content from over 30 different sources, including Citysearch and the NileGuide website, for 200 destinations.