1. A method of automatically sharing user-relevant information between handheld devices, the method comprising: storing interest profiles of a plurality of users of handheld devices in a centralized location, the centralized location allowing a user to share his/her profile with others; obtaining from the centralized location a list of users with profiles similar to the profile of the user; marking a sharable item of the user with users to whom the item is relevant; synchronizing the list and the marked sharable items to the user's handheld device; and providing automatic relevance-based sharing of items, including the sharable item, between the handheld device of the user and another handheld device, wherein the sharing may be initiated by the handheld device of the user or the other handheld device.