10. A system for identifying product-related information on a web page, comprising: a first computer having a first computer-readable storage medium containing: a copy of source code for a first web page, one or more first computer programs configured to parse the copy of the source code to identify all text nodes and analyze the text nodes to identify any text nodes that contain product-related information; one or more second computer programs configured to generate vectors describing the locations of the text nodes containing product-related information, analyze one or more of the vectors to identify one or more patterns and generate one or more models that discriminate between text nodes that contain product-related information and text nodes that do not contain product-related information on a second web page; and a user computer coupled to the first computer having a second computer-readable storage medium, wherein the one or more models are transmitted to the second user computer, stored in the second computer-readable medium, and used to identify and extract information about one or more products available for sale on one or more merchant web pages as the web pages are displayed to the user.
10. A system for identifying product-related information on a web page, comprising: a first computer having a first computer-readable storage medium containing: a copy of source code for a first web page, one or more first computer programs configured to parse the copy of the source code to identify all text nodes and analyze the text nodes to identify any text nodes that contain product-related information; one or more second computer programs configured to generate vectors describing the locations of the text nodes containing product-related information, analyze one or more of the vectors to identify one or more patterns and generate one or more models that discriminate between text nodes that contain product-related information and text nodes that do not contain product-related information on a second web page; and a user computer coupled to the first computer having a second computer-readable storage medium, wherein the one or more models are transmitted to the second user computer, stored in the second computer-readable medium, and used to identify and extract information about one or more products available for sale on one or more merchant web pages as the web pages are displayed to the user. 12. The system of claim 10 , wherein the vectors are 4-place vectors.