1. A portable computing device configured for content-based navigation and launching on a portable computing device, comprising: a processor for executing one or more sets of instructions to carry out desired functionality of the portable computing device; and a content navigator module executable by the processor, and for allowing a user to customize a content-based launching pad, whereupon unrelated types of digital content files are grouped into user-created categories, thereby enabling content-based navigation and launching on the portable computing device.