As a result of further expansion of Information Communication Technologies (ICT), one can observe the emergence of a new trend in using the technologies now: a global virtualization of the world that is expressed through the term 'cloud computing'. Cloud computing is the future generation of computing which is characterized by main entities - Software, Hardware, Network and ability to use the remote portable resources such as a results of some computations. The collective nature of all these entities, as combined into a coherent system with modern computational features such as mobility, is known as the Cloud [1]. Mobility and mobile computing play a significant role in this context [2]. Because of continued miniaturization, ubiquitous communication, and increasing computation power, mobile handheld (aka Personal Digital Assistant - PDA) users can now perform many online tasks on the go, including web browsing, document editing, multimedia streaming, and Internet banking, to name a few [3].
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