The present invention relates generally to methods usable with handheld devices (e.g., music players or cell phones) and cell phones. One claim recites a cell phone including: an input or interface to receive first content corresponding to audio or video; a media player to render audio or video; an analyzer to derive a plural-bit identifier from portions of the first content representing audio elements of the audio or video picture elements of the video; data indicating at least some capabilities of the media player; and a controller to control: i) communicating the plural-bit identifier and the data indicating the at least some capabilities of the media player to a network resource to obtain enhanced content therefrom, the enhanced content being enhanced relative to the first content, and the enhanced content being associated with the plural-bit identifier and the media player; and ii) obtaining the enhanced content from the network resource. Of course, other claims and combinations are provided as well.