Various embodiments enable a user of a mobile media device to select one or more channels to load onto the device. Each channel comprises a collection of media content files, such as video content, audio content, and so on. Each collection of media content files can be associated with a particular genre (or genres) of media content. A channel can be managed such that its collection of media content can be rearranged, augmented, and/or otherwise edited to produce a refreshed version of the channel. A user's interaction with content within a channel can be monitored to produce behavior data about the user. The behavior data can be used to customize the playback of a particular channel to reflect user preferences. The behavior data can also be used to produce channels that are custom tuned for the user and can be used to produce a customized version of a mobile media device.