100 Incredibly Useful and Interesting Web Sites - PCWorld. Even as the Web has become more entertaining--and certainly better looking--over the past 15 years, it has also become much more useful and practical, as the 100 sites in this feature will demonstrate.
I've organized the sites in the list by the type of task they help you with. It is not a ranking; in each category I recommend sites that specialize in a different area than the others. Google Scholar. Search and Metasearch Engines. SHODAN - Computer Search Engine.