1. A market data acquisition system, comprising: a means for retrieving event and embedded content data from a plurality of set-top boxes; a means for retrieving content attributes from a content attribute database; a means for correlating retrieved set-top box event data with content attributes to produce data indicating which content was experienced through the plurality of set-top boxes; a means for retrieving demographic information from a demographic information database; and a means for correlating demographic information to data indicating which content was experienced through the plurality of set-top boxes to produce, in response to a query, data indicating content experienced by a demographic group or set of demographic groups.