Top on the Web

TOP OFs - TOP on the Web

ALEXA
Alexa Internet, Inc. is a California-based subsidiary company of Amazon.com which provides commercial web traffic data.(Updated Daily)
Alexa - Top Sites by Country (choose a country)
Alexa - Top Sites in Greece 
Alexa - Top Sites by Category (choose a category)

Top Websites - Searches - Trends
Google: Explore Trends
Google: Hot Searches
Google: Tot Charts
A list of the 100 most popular websites, worldwide. - Wikipedia

Top YouTube Videos
YouTube's Most Viewed Videos
A list of YouTube most viewed videos from Oct 18, 2012 untill today.
YouTube's MyTop10Videos