5. The method of claim 4 , further comprising: wherein said content sources include an electronic mail system, an instant messaging system, a calendar event scheduling system, a file system, a voice mail system, and a telephone conversation recording system; and wherein said received content items include electronic mail messages, instant messaging session transcripts, calendar event invitations, files, voice mail messages, and recorded telephone conversations.
5. The method of claim 4 , further comprising: wherein said content sources include an electronic mail system, an instant messaging system, a calendar event scheduling system, a file system, a voice mail system, and a telephone conversation recording system; and wherein said received content items include electronic mail messages, instant messaging session transcripts, calendar event invitations, files, voice mail messages, and recorded telephone conversations. 6. The method of claim 5 , further comprising: wherein said state changes include one of the set consisting of said user responding to an electronic mail message, said user responding to a calendar event invitation, said user modifying a file, and said user listening to a voice mail message.