Tutorials like this one is not really bookmark material. You'll read it once. No need to come back to this page later. Data mining means getting information from fairly large and frequently updated resources. Resources like our search engine list is bookmark material.
Any exhaustive links list, glossary of terms etc.
You can - as long as you don't change it and include everything from the title at the top to the copyright notice below. You may not remove or edit links. A top web site profiled each Monday.