With Google Trends, you can compare the world's interest in your favorite topics. Enter up to five topics and see how often they've been searched on Google over time. Google Trends also shows how frequently your topics have appeared in Google News stories, and in which geographic regions people have searched for them most.

Internet ratings service with visitor profiles for millions of websites and services.

blekko's web search uses slashtags that narrow your search to only the sites or concepts you want

Find out about a domain, including who owns it and their contact information, what server software it runs, usage ranking among many other useful information bits

Use the Yahoo web directory when you want to find sites specializing in a given topic or you are looking for a specific Web site home page