I never understood the pleasure of sharing until i visited www.flickr.com
At this site its the Internet philosophy of sharing that is at full bloom.
Flickr is a photo sharing site and real people share their photos to Internet users. No money, no paying, all is free. I needed some photos for a presentation on something related to plants, and i got photos of all kinds of plants and flowers there. Its not the thumbnail photos, that come up on a google search but real high quality photos taken with cameras like the Canon powershot.

Some other sites I know that are great:
www.alexa.com  (Traffic Rankings for all countries)
www.digg.com  (news about people, digged up by people)
http://del.icio.us  (store bookmarks/hyperlinks)
www.myspace.com (friendship)
www.communities.com (friendship/dating, probably the most loved site on the Net)
www.moneybookers.com (does what paypal do, but offers cheques in INR)
www.facebook.com (rediff connexions is a clone of this site)
www.smashits.com (hindi songs online, but be careful not to download screensavers)
www.smashitsusa.com (all english songs)
www.dishant.com (high quality windows media hindi songs)
www.gayaki.com (hindi songs, low quality, for dial up)
www.howstuffworks.com (answers to everything)

thats all i can remember at the moment
i would be glad if i shared anything valuable to people who read my blogs