Here are a few websites which i think are worth a visit atleast once.. I like these websites... 

http://www.wikipedia.com    (For all kind of information)

http://www.orkut.com    (For getting to know people)

http://www.metacafe.com    (For free videos)

http://www.mGinger.com    (For free ads on your mobile)

http://www.masti4india.com    (For free latest hindi songs)

There are many many more and i shall keep adding them as and when i remember.. So do keep coming back and check out this page for additions..