1. A system for providing content from a plurality of feeds to which a user subscribes, the system comprising: a computing device configured to: receive user input indicating the user's selection of two or more feeds that defines, as a first feed set, a first subset of the plurality of feeds to which the user subscribes, the first subset of feeds including multiple feeds, the first subset of feeds lacking at least one feed of the plurality of feeds to which the user subscribes; and to transmit the definition of the first feed set; a server configured to: receive, from the computing device, the definition of the first feed set; assign a first feed set identifier to the first feed set; associate the first feed set identifier, which is assigned to the first feed set, with a user identifier assigned to the user; associate a second feed set identifier with the user identifier assigned to the user, the second feed set identifier being assigned to a second subset of the plurality of feeds to which the user subscribes, the second subset of feeds including multiple feeds, the second subset of feeds lacking at least one feed of the plurality of feeds to which the user subscribes; and send data indicating the first and second feed sets; and a handheld device configured to: receive the data indicating the first and second feed sets; display, on a user interface of the handheld device, the first and second feed sets; receive, through the user interface of the handheld device, user input indicating a selection of the first feed set displayed on the user interface; send data indicating the selection of the first feed set to the server; receive, from the server, a mark-up language document that includes content derived from at least one feed entry from each feed of the selected first feed set; and display, on the user interface of the handheld device, the mark-up language document that includes the content derived from at least one feed entry from each feed of the selected feed set.