A slang verb, to screenscrape.
Screenscraping is a way of extracting data from a web page. it's just based on parsing the code of the page and extracting the required data using string parsing.
It's intrinsically more unreliable than an XML or RSS feed, as your code is liable to be broken if the webpage's formating or content changes
see wikipedia http://en.wikipedia.org/wiki/Screenscraping
it's ofter used for mashups, see wikipedia http://en.wikipedia.org/wiki/Mashup_%28web_application_hybrid%29