61. A system, comprising: one or more computer systems, each comprising at least a memory configured to store program instructions and a processor configured to execute program instructions, wherein the program instructions are executable by the one or more computer systems to implement: a web services interface configured to receive, according to a web services protocol, indications of navigation traffic directed to respective ones of a plurality of online content sources; a traffic analysis engine configured to receive said indications from said web services interface; and a search engine configured to, in response to a keyword query, determine a result set including one or more of said plurality of online content sources, wherein each of the included one or more online content sources satisfies one or more keywords of the keyword query; wherein said traffic analysis engine is and further configured, for a given one of the online content sources included in said result set, to identify and generate corresponding representations of one or more aggregate paths including said given online content source, wherein each of the one or more aggregate paths includes one or more navigation paths among said plurality of online content sources as reflected by said indications of navigation traffic, wherein each of the one or more navigation paths is indicative of an access request by one or more users that originates from a corresponding originating one of said online content sources to access a corresponding destination one of said online content sources, wherein each such access request indicated by a navigation path occurs prior to generating representations of said one or more aggregate paths, wherein a representation of a given one of said one or more aggregate paths is indicative of multiple ones of said online content sources; and wherein for said given online content source, said search engine is further configured to cause representations of one or more aggregate paths including said given online content source to be displayed.
61. A system, comprising: one or more computer systems, each comprising at least a memory configured to store program instructions and a processor configured to execute program instructions, wherein the program instructions are executable by the one or more computer systems to implement: a web services interface configured to receive, according to a web services protocol, indications of navigation traffic directed to respective ones of a plurality of online content sources; a traffic analysis engine configured to receive said indications from said web services interface; and a search engine configured to, in response to a keyword query, determine a result set including one or more of said plurality of online content sources, wherein each of the included one or more online content sources satisfies one or more keywords of the keyword query; wherein said traffic analysis engine is and further configured, for a given one of the online content sources included in said result set, to identify and generate corresponding representations of one or more aggregate paths including said given online content source, wherein each of the one or more aggregate paths includes one or more navigation paths among said plurality of online content sources as reflected by said indications of navigation traffic, wherein each of the one or more navigation paths is indicative of an access request by one or more users that originates from a corresponding originating one of said online content sources to access a corresponding destination one of said online content sources, wherein each such access request indicated by a navigation path occurs prior to generating representations of said one or more aggregate paths, wherein a representation of a given one of said one or more aggregate paths is indicative of multiple ones of said online content sources; and wherein for said given online content source, said search engine is further configured to cause representations of one or more aggregate paths including said given online content source to be displayed. 64. The system as recited in claim 61 , wherein in response to detecting a selection of a particular online content source from one of said one or more aggregate paths, said search engine is further configured to associate one or more keywords included in said keyword query with said particular online content source.