33. The system of claim 25 wherein the legitimacy rating further comprises an aggregate user rating of the document provider.
25. A system for providing a legitimacy rating of a content source associated with a document, comprising: an input receiver for receiving from a user a request for a document associated with a concept; a selection processor for selecting an electronic document from a document provider based on relevance to the concept, the electronic document associated with a content source; a legitimacy rating processor for determining a legitimacy rating of the content source, wherein the legitimacy rating is based on a history rating and a transaction volume rating and wherein at least one of the history rating and the transaction volume rating comprise a metric that is normalized based on at least one of history ratings and transaction volume ratings of a plurality of content sources who provide documents to the document provider; and an output device for providing the electronic document and the legitimacy rating to the user in response to the request.