10. A system for listing documents, comprising: one or more processors and memory, the memory comprising one or more sources of document information; and one or more modules including instructions to: access the sources of document information, wherein the sources are associated with a website server; extract the document information including metadata from the sources; generate a sitemap of a website at the website server, the sitemap including a list of documents and corresponding metadata for each of a plurality of documents in the list of documents based on the document information, wherein the metadata comprises at least one of the group consisting of: document modification date information associated with the plurality of documents, document access frequency information associated with the plurality of documents, document priority information associated with the plurality of documents, and document update rate information associated with the plurality of documents, wherein the document priority information indicates a crawling priority; and store the sitemap at a location; and transmit a notification from the website server to a remote computer associated with a web crawler system, the notification including information that identifies the location of the sitemap, the notification functioning as an indication that the sitemap is available for access.
12. The system of claim 10 , wherein the document metadata information comprises at least relative priority information associated with the plurality of documents, wherein the relative priority information indicates a crawling priority.