19. The method of claim 18 , further comprising, upon receiving a document request in step (e), the step of updating said popularity value for said document.
19. The method of claim 18 , further comprising, upon receiving a document request in step (e), the step of updating said popularity value for said document. 20. The method of claim 19 , wherein said step of updating said popularity value for said document includes the step of incrementing for said document a counter associated with said requested action.