The document discusses 5 mobile marketing channels that aspiring marketers can take advantage of: 1) mobile display ads, 2) SMS marketing, 3) mobile search advertising, 4) in-app advertising, and 5) MMS and mobile video. It provides examples of how each channel can be used and highlights opportunities they present. The conclusion encourages marketers to get started with mobile and outlines potential objectives like building mobile user lists and crafting synergy across channels.