1. A computer-readable medium storing computer-executable instructions executed by a processor for causing a computer-controlled apparatus to implement a tag-mediated review system for electronic content, the executed computer-executable instructions performing a method comprising the steps of: obtaining on-line access to an infrastructure of a plurality of electronic source documents, wherein each electronic source document comprises source content supplied by an associated content producer and a plurality of content tags identifying subject matter contained within the source content; receiving a plurality of reviews concerning the accessed plurality of electronic source documents, each review expressing quality assessment information for a corresponding electronic source document by an associated reviewer and one or more review tags identifying subject matter addressed by the review; computing a tag-mediated content quality score for each electronic source document based at least in part on the plurality of received reviews, wherein the computed tag-mediated content quality score is based on tag scores for one or more of the corresponding content tags and one or more of the corresponding review tags; compiling a content quality information database storing the tag-mediated content quality scores in association with corresponding content tags, review tags and identifiers of the plurality of electronic source documents; receiving a document retrieval request; retrieving information identifying one or more electronic source documents responsive to the received document retrieval request and the tag-mediated content quality scores associated with the responsive one or more electronic source documents; and displaying information identifying the responsive electronic source documents and the associated tag-mediated content quality scores or ranking the responsive electronic source documents in a priority order based directly or indirectly on the associated tag-mediated content quality scores and displaying indicators for the responsive electronic documents in the priority order.
9. The computer-readable medium of claim 1 , further comprising the steps of: receiving a plurality of moderator reports concerning the reviews, each moderator report expressing quality assessment information for a review by an associated moderator and one or more tags identifying subject matter addressed by the moderator report; computing a tag-mediated reviewer rank for each reviewer based on the moderator reports, wherein each tag-mediated reviewer rank includes tag scores for one or more tags in the associated reviews; storing the tag-mediated reviewer ranks in the content quality information database in association with the associated tags and identifiers of the associated reviewers; wherein the computation of the a tag-mediated content quality score for each electronic source document is based at least in part on the reviewer ranks of one or more reviewers who have submitted reviews concerning the electronic source document.