34. 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; a selection processor for selecting an electronic document from a document provider, 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 subset of content sources who provide documents to the document provider, wherein the subset of content sources are selected based on a similarity to the content source; and an output device for providing the electronic document and the legitimacy rating to the user in response to the request.
34. 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; a selection processor for selecting an electronic document from a document provider, 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 subset of content sources who provide documents to the document provider, wherein the subset of content sources are selected based on a similarity to the content source; and an output device for providing the electronic document and the legitimacy rating to the user in response to the request. 45. The system of claim 34 wherein the legitimacy rating further comprises an aggregate user rating of the document provider.