There are few websites you cannot live without :

Search Engine - I guess www.google.com, www.bing.com and www.yahoo.com

Social Networking - includes orkut, facebooks,myspace, H15, twitter

Jobs - indeed, naukri and monster

Shopping - Amazon and Ebay

Feeds - feedburner

Analytics - google analytics

Videos - youtube, metacafe

Email - google's gmail, yahoo mail, hotmail

Messanger - gtalk, yahoo, AIM, ICQ, windows Live messanger, skype

Payment - paypal

Images - flickr

Maps - google and yahoo maps

News - google news

Questions -yahoo ask

Wiki - wikepadia

Zip - winzip

Downloads - download.com, torrent, rapidshare, megaupload

Bookmarking - digg, delicious.com

Postings - Craigslist.org

Hosting - godaddy.com, ixwebhosting

.. just search for those keywords in google..