1. A user-interface method of selecting and presenting a collection of content items in which the presentation is ordered at least in part based on navigation and selection behavior of the user learned over time, the method comprising providing a content system including a set of content items, each content item having an associated relevance weight on a per user basis to indicate a relative measure of a likelihood that the content item is desired by the user, and each content item being associated with an actual person; organizing the set of content items into groups of content items, each group of content items having an associated relevance weight on a per user basis to indicate a relative measure of a likelihood that the group of content items is desired by the user, and wherein a content item is placed into a group of content items by the content system based in part on actual groups of which the associated actual person is a member; providing initial associated relevance weights for the content items, wherein the initial associated relevance weight is based in part on the organizational relationship of the user to other actual persons; providing initial associated relevance weights for the groups of content items, wherein the initial associated relevance weight assigned by the system is based in part on the probability of the user wanting to contact a member of the actual group associated with the group of content items; receiving input entered by the user for identifying desired content items; in response to the input entered by the user, selecting and presenting a subset of content items and content groups to the user as a navigable topology of content items and content groups wherein the content items and content groups are ordered at least in part by the initial associated relevance weights assigned to the content items; receiving input entered by the user for navigating through topology of the subset of content items and content groups and for identifying and selecting the desired content items; in response to a selection by the user of a content item, presenting the content item to the user, adjusting the associated relevance weight of the content item, and adjusting the associated relevance weight of the group of content items containing the selected item; in response to receiving subsequent input entered by the user, selecting and presenting a subset of content items and content groups to the user wherein the content items and content groups are ordered at least in part by the adjusted associated relevance weights assigned to the content items and content groups such that content items with greater associated relevance weights are presented as more relevant content items within a content group and groups of content items with greater associated relevance weights are presented as more relevant groups of content items.