2. Objective C Apple's iPhone has created a great buzz in the Smartphone industry because of its rich UI and plethora of features. The demand for iPhone app developers is increasing and knowing the new platform and skills is all what developers need to do. Writing objective C program code from scratch, ability to use existing APIs and knowledge of various frameworks needed for development is must thing which iPhone developers should know. 3. HTML5 Although there has been no finalized HTML5 standard, but a lot of web browsers, and even mobile web browsers, have now some HTML5 capabilities. And, it will really help in the development cycle for basic applications. HTML5 will take us miles forward and diminish the difference between the desktop and the mobile environment. HTML5 is a critical step for mobile web application development. Some of the key elements that it provides are - offline support, canvas and video, geolocation API and advanced forms.