15. A system, comprising: one or more computer devices comprising: means for receiving, from a user, a first request to perform a search, where the first request includes a first search query; means for performing a first search of a collection of documents, based on the first search query, to identify a set of search result documents; means for receiving a request to save a selected search result document of the plurality of search result documents; means for saving information associated with the selected search result document in response to the request to save the selected search result document; means for receiving, from the user, a second request to perform a search, where the second request includes a second search query, and where the second request is received after the first request is received; means for performing a second search, based on the second search query, to generate a list of search result documents; means for identifying a particular search result document, in the list of search result documents, that is similar to the selected search result document based on the saved information and, where the means for identifying includes at least two of: means for determining whether the particular search result document and the selected search result document have a plurality of outgoing links that point to the same documents, means for determining whether the particular search result document and the selected search result document have a plurality of incoming links that come from the same documents, means for determining whether the particular search result document and the selected search result document have a same format, or means for determining whether the particular search result document and the selected search result document have a same layout; means for boosting, based on identifying whether the particular search result document is similar to the selected search result document, a score for the particular search result document to obtain a boosted score; and means for providing the list of search result documents, where the means for providing includes means for providing the particular search result document based on the boosted score.
15. A system, comprising: one or more computer devices comprising: means for receiving, from a user, a first request to perform a search, where the first request includes a first search query; means for performing a first search of a collection of documents, based on the first search query, to identify a set of search result documents; means for receiving a request to save a selected search result document of the plurality of search result documents; means for saving information associated with the selected search result document in response to the request to save the selected search result document; means for receiving, from the user, a second request to perform a search, where the second request includes a second search query, and where the second request is received after the first request is received; means for performing a second search, based on the second search query, to generate a list of search result documents; means for identifying a particular search result document, in the list of search result documents, that is similar to the selected search result document based on the saved information and, where the means for identifying includes at least two of: means for determining whether the particular search result document and the selected search result document have a plurality of outgoing links that point to the same documents, means for determining whether the particular search result document and the selected search result document have a plurality of incoming links that come from the same documents, means for determining whether the particular search result document and the selected search result document have a same format, or means for determining whether the particular search result document and the selected search result document have a same layout; means for boosting, based on identifying whether the particular search result document is similar to the selected search result document, a score for the particular search result document to obtain a boosted score; and means for providing the list of search result documents, where the means for providing includes means for providing the particular search result document based on the boosted score. 22. The system of claim 15 , where the means for identifying that the particular search result document is similar to the selected search result document, includes: means for determining that the search result document and the selected search result document are located on a same web site, means for determining that the search result document and the selected search result document have a same ratio of images to text, means for determining that a majority of words, in the search result document and the selected search result document, match, means for determining that a majority of uncommon words, in the search result document and the selected search result document, match, means for determining that the search result document and the selected search result document have a plurality of outgoing links pointing to the same documents, means for determining that the search result document and the selected search result document have a plurality of incoming links coming from the same documents, means for determining that the search result document and the selected search result document have same meta-data tags, means for determining that the search result document and the selected search result document have a same format, and means for determining that the search result document and the selected search result document have a same layout.