17. A method of operating a computing device to search a network of pages, comprising: querying to a collection of information about the pages of the network of pages, wherein the collection of information about the pages includes: an index of the pages; and a collection of scores for the pages generated according to the steps of: for each of at least particular ones of the plurality of documents, assigning a score to that particular document, with respect to a particular topic, based at least in part on a characterization of topic incoherency associated with at least one document linking, from the at least one document with which the characterization of topic incoherency is associated, to that particular document, wherein the characterization of topic incoherency of the at least one document linking, from the at least one document with which the characterization of topic incoherency is associated, to that particular document is an indication of an amount of topic-specific score authority for each of multiple topics of the at least one document linking to that particular document, wherein the higher the topic-specific authority for each of multiple topics of the at least one document linking to that particular document, the indicated topic incoherency associated with the at least one document linking to that particular document is higher; wherein the score assigned to that particular document is reduced based on higher topic incoherency of the at least one document linking to that particular document; and wherein the steps by which the collection of scores for the pages generated further include determining a value indicative of a probability of not linking to any of the at least particular ones of the plurality of documents; and accounting for the determined value with respect to scores of documents other than the at least particular ones of the plurality of documents; and the method of operating the computing device to search a network of pages further comprising receiving, in response to the query, an indication of pages according to the index of pages, ranked according to the collection of scores.
17. A method of operating a computing device to search a network of pages, comprising: querying to a collection of information about the pages of the network of pages, wherein the collection of information about the pages includes: an index of the pages; and a collection of scores for the pages generated according to the steps of: for each of at least particular ones of the plurality of documents, assigning a score to that particular document, with respect to a particular topic, based at least in part on a characterization of topic incoherency associated with at least one document linking, from the at least one document with which the characterization of topic incoherency is associated, to that particular document, wherein the characterization of topic incoherency of the at least one document linking, from the at least one document with which the characterization of topic incoherency is associated, to that particular document is an indication of an amount of topic-specific score authority for each of multiple topics of the at least one document linking to that particular document, wherein the higher the topic-specific authority for each of multiple topics of the at least one document linking to that particular document, the indicated topic incoherency associated with the at least one document linking to that particular document is higher; wherein the score assigned to that particular document is reduced based on higher topic incoherency of the at least one document linking to that particular document; and wherein the steps by which the collection of scores for the pages generated further include determining a value indicative of a probability of not linking to any of the at least particular ones of the plurality of documents; and accounting for the determined value with respect to scores of documents other than the at least particular ones of the plurality of documents; and the method of operating the computing device to search a network of pages further comprising receiving, in response to the query, an indication of pages according to the index of pages, ranked according to the collection of scores. 18. The method of claim 17 , further comprising: accessing at least one of the pages indicated by the received indication of pages.