8. The system of claim 2 , further comprising: logic for determining a context in which the user preformed the selection actions, the context including at least one of geographic location of the user, day, date, and time; and logic for associating the contexts of the user selection actions with the adjusted relevance weighting of content items learned from the corresponding user selections; wherein only adjusted relevance weightings associated with the context in which the user enters a subsequent input are used in the selecting and ordering of the content items.
2. A user-interface system for selecting and presenting a collection of items in which the presentation is ordered at least in part based on navigation and selection behavior of a user learned over time, the system comprising: logic for providing access to a set of items; logic for associating an initial relevance weight, on a per user basis, with each of a plurality of the items of the set to indicate a relative measure of a likelihood that the item is desired by the user; logic for receiving input entered by the user for identifying desired items; logic, responsive to the input entered by the user, for selecting and presenting a subset of items to the user as a navigable topology of items wherein the items are ordered at least in part by the initial associated relevance weights associated with the items; logic for receiving input entered by the user for navigating through the topology of the subset of items and for identifying and selecting the desired items; logic, responsive to a selection by the user of an item, for presenting said item to the user and for adjusting the associated relevance weight of said item; logic for selecting and presenting a subset of items to the user subsequent to adjusting the associated relevance weight of any of the items, wherein the items are ordered at least in part by the adjusted associated relevance weights assigned to the items such that items with greater associated relevance weights are presented as more relevant items.