The popularity of portable devices has spread far and wide. With more areas being covered by WiFi (wireless Internet access), portable devices become even more attractive. Portable devices include laptops, netbooks or the Ultra Mobile PC and portable media players. There are special softwares that can easily convert audio and video into the digital format for use in these portable devices. They are becoming indispensable gadgets at work, leisure and entertainment. The portable gadgets include digital audio players, digital video recorders, portable video players and personal digital assistant.