19. The method of claim 17 wherein presenting at said client computer at least one of a concept map, facts listing, a text summary, a tag cloud, an index and an annotated text comprises receiving as user input a summary length, determining link counts of said tree elements and selecting said summary length number of said at least one sentences having highest said link counts.
19. The method of claim 17 wherein presenting at said client computer at least one of a concept map, facts listing, a text summary, a tag cloud, an index and an annotated text comprises receiving as user input a summary length, determining link counts of said tree elements and selecting said summary length number of said at least one sentences having highest said link counts. 20. The method of claim 19 further comprising receiving a user selection of one or more keywords, and wherein selecting said summary length number of said at least one sentences having highest said link counts comprises selecting said summary length number of said at least one sentences in accordance with said keywords.