15. A non-transitory computer readable storage media having computer readable code thereon for dynamically modifying search results comprising code for: receiving one or more keywords for use as search terms from a user; providing a first set of search result objects; providing a first set of advertisement objects related to said first set of search result objects; monitoring which of said objects, search results and advertisements, is selected by said user; compiling information to infer user intent based on said document the user clicks on; automatically re-ranking said first set of search result objects based on said inferred user intent; compiling said re-ranked first set of search result objects; displaying to said user the re-ranked documents; upon said user clicking to return from said object to said set of search result objects including said object, immediately automatically inserting into said first set of objects advertisement objects based on said inferred user intent, so that a user clicking on a single object from said first set of objects results in new advertisement objects, so that upon said user returning from said document to said first set of search result objects including said object the new advertisement objects will be visible; doing said insertion based on determining subordinate keywords based on user clicking actions; weighting said subordinate keywords in accordance with an inferred likelihood of user interest; displaying ads based on the most highly weighted of said subordinate keywords.
15. A non-transitory computer readable storage media having computer readable code thereon for dynamically modifying search results comprising code for: receiving one or more keywords for use as search terms from a user; providing a first set of search result objects; providing a first set of advertisement objects related to said first set of search result objects; monitoring which of said objects, search results and advertisements, is selected by said user; compiling information to infer user intent based on said document the user clicks on; automatically re-ranking said first set of search result objects based on said inferred user intent; compiling said re-ranked first set of search result objects; displaying to said user the re-ranked documents; upon said user clicking to return from said object to said set of search result objects including said object, immediately automatically inserting into said first set of objects advertisement objects based on said inferred user intent, so that a user clicking on a single object from said first set of objects results in new advertisement objects, so that upon said user returning from said document to said first set of search result objects including said object the new advertisement objects will be visible; doing said insertion based on determining subordinate keywords based on user clicking actions; weighting said subordinate keywords in accordance with an inferred likelihood of user interest; displaying ads based on the most highly weighted of said subordinate keywords. 20. The computer readable media of claim 15 further comprising code for: cumulatively using analysis of user intent to re-rank said set of search result objects based on subsequent documents said user clicks on and skips.